87613 has 2 divisors, whose sum is σ = 87614. Its totient is φ = 87612.

The previous prime is 87589. The next prime is 87623. The reversal of 87613 is 31678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85849 + 1764 = 293^2 + 42^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87613 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43806 + 43807.

It is an arithmetic number, because the mean of its divisors is an integer number (43807).

2⁸⁷⁶¹³ is an apocalyptic number.

It is an amenable number.

87613 is a deficient number, since it is larger than the sum of its proper divisors (1).

87613 is an equidigital number, since it uses as much as digits as its factorization.

87613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 87613 is about 295.9949323891. The cubic root of 87613 is about 44.4143029428.

The spelling of 87613 in words is "eighty-seven thousand, six hundred thirteen".