87256613 has 2 divisors, whose sum is σ = 87256614. Its totient is φ = 87256612.

The previous prime is 87256601. The next prime is 87256633. The reversal of 87256613 is 31665278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82319329 + 4937284 = 9073^2 + 2222^2 .

It is a cyclic number.

It is not a de Polignac number, because 87256613 - 2¹⁰ = 87255589 is a prime.

It is a super-2 number, since 2×87256613² = 15227433024463538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87256633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43628306 + 43628307.

It is an arithmetic number, because the mean of its divisors is an integer number (43628307).

Almost surely, 2^87256613 is an apocalyptic number.

It is an amenable number.

87256613 is a deficient number, since it is larger than the sum of its proper divisors (1).

87256613 is an equidigital number, since it uses as much as digits as its factorization.

87256613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 87256613 is about 9341.1248252017. The cubic root of 87256613 is about 443.5399914029.

The spelling of 87256613 in words is "eighty-seven million, two hundred fifty-six thousand, six hundred thirteen".