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53131561 = 77590223
BaseRepresentation
bin1100101010101…
…1100100101001
310200222100210121
43022223210221
5102100202221
65134443241
71213416340
oct312534451
9120870717
1053131561
1127a9a58a
1215963521
13b0138c2
1470b0b57
1549e7a41
hex32ab929

53131561 has 4 divisors (see below), whose sum is σ = 60721792. Its totient is φ = 45541332.

The previous prime is 53131553. The next prime is 53131571. The reversal of 53131561 is 16513135.

53131561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 53131561 - 23 = 53131553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53131571) 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, 3795105 + ... + 3795118.

It is an arithmetic number, because the mean of its divisors is an integer number (15180448).

Almost surely, 253131561 is an apocalyptic number.

It is an amenable number.

53131561 is a deficient number, since it is larger than the sum of its proper divisors (7590231).

53131561 is an equidigital number, since it uses as much as digits as its factorization.

53131561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590230.

The product of its digits is 1350, while the sum is 25.

The square root of 53131561 is about 7289.1399355480. The cubic root of 53131561 is about 375.9391240852.

Adding to 53131561 its reverse (16513135), we get a palindrome (69644696).

The spelling of 53131561 in words is "fifty-three million, one hundred thirty-one thousand, five hundred sixty-one".

Divisors: 1 7 7590223 53131561