12565537 has 2 divisors, whose sum is σ = 12565538. Its totient is φ = 12565536.

The previous prime is 12565519. The next prime is 12565541. The reversal of 12565537 is 73556521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11229201 + 1336336 = 3351^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565537 - 2⁷ = 12565409 is a prime.

It is equal to p₈₂₂₆₈₈ and since 12565537 and 822688 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12565547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282768 + 6282769.

It is an arithmetic number, because the mean of its divisors is an integer number (6282769).

Almost surely, 2^12565537 is an apocalyptic number.

It is an amenable number.

12565537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565537 is an equidigital number, since it uses as much as digits as its factorization.

12565537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 34.

The square root of 12565537 is about 3544.7901207265. The cubic root of 12565537 is about 232.4843293096.

The spelling of 12565537 in words is "twelve million, five hundred sixty-five thousand, five hundred thirty-seven".