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31140017 = 101308317
BaseRepresentation
bin111011011001…
…0100010110001
32011121002001222
41312302202301
530432440032
63031234425
7525454136
oct166624261
964532058
1031140017
1116639a57
12a518a15
1365b3b5c
1441c858d
152b01a12
hex1db28b1

31140017 has 4 divisors (see below), whose sum is σ = 31448436. Its totient is φ = 30831600.

The previous prime is 31139981. The next prime is 31140029. The reversal of 31140017 is 71004113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71004113 = 487145799.

It can be written as a sum of positive squares in 2 ways, for example, as 28718881 + 2421136 = 5359^2 + 1556^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140017 - 28 = 31139761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31139977 and 31140004.

It is not an unprimeable number, because it can be changed into a prime (31140047) 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, 154058 + ... + 154259.

It is an arithmetic number, because the mean of its divisors is an integer number (7862109).

Almost surely, 231140017 is an apocalyptic number.

It is an amenable number.

31140017 is a deficient number, since it is larger than the sum of its proper divisors (308419).

31140017 is a wasteful number, since it uses less digits than its factorization.

31140017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308418.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 31140017 is about 5580.3240945307. The cubic root of 31140017 is about 314.6103083964.

The spelling of 31140017 in words is "thirty-one million, one hundred forty thousand, seventeen".

Divisors: 1 101 308317 31140017