87897613 has 2 divisors, whose sum is σ = 87897614. Its totient is φ = 87897612.

The previous prime is 87897577. The next prime is 87897631. The reversal of 87897613 is 31679878.

Together with next prime (87897631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83411689 + 4485924 = 9133^2 + 2118^2 .

It is a cyclic number.

It is not a de Polignac number, because 87897613 - 2⁹ = 87897101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87897653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43948806 + 43948807.

It is an arithmetic number, because the mean of its divisors is an integer number (43948807).

Almost surely, 2^87897613 is an apocalyptic number.

It is an amenable number.

87897613 is a deficient number, since it is larger than the sum of its proper divisors (1).

87897613 is an equidigital number, since it uses as much as digits as its factorization.

87897613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The square root of 87897613 is about 9375.3726859256. The cubic root of 87897613 is about 444.6234461305.

The spelling of 87897613 in words is "eighty-seven million, eight hundred ninety-seven thousand, six hundred thirteen".