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31395089 = 112854099
BaseRepresentation
bin111011111000…
…0110100010001
32012002000222002
41313300310101
531014120324
63040523345
7530565605
oct167606421
965060862
1031395089
11167a3660
12a620555
136672c9b
144253505
152b523ae
hex1df0d11

31395089 has 4 divisors (see below), whose sum is σ = 34249200. Its totient is φ = 28540980.

The previous prime is 31395083. The next prime is 31395103. The reversal of 31395089 is 98059313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98059313 = 118914483.

It is a cyclic number.

It is not a de Polignac number, because 31395089 - 216 = 31329553 is a prime.

It is a super-2 number, since 2×313950892 = 1971303226635842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31395083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427039 + ... + 1427060.

It is an arithmetic number, because the mean of its divisors is an integer number (8562300).

Almost surely, 231395089 is an apocalyptic number.

It is an amenable number.

31395089 is a deficient number, since it is larger than the sum of its proper divisors (2854111).

31395089 is a wasteful number, since it uses less digits than its factorization.

31395089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854110.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 31395089 is about 5603.1320705477. The cubic root of 31395089 is about 315.4669784935.

It can be divided in two parts, 313950 and 89, that multiplied together give a triangular number (27941550 = T7475).

The spelling of 31395089 in words is "thirty-one million, three hundred ninety-five thousand, eighty-nine".

Divisors: 1 11 2854099 31395089