87715139 has 2 divisors, whose sum is σ = 87715140. Its totient is φ = 87715138.

The previous prime is 87715093. The next prime is 87715157. The reversal of 87715139 is 93151778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87715139 - 2²⁰ = 86666563 is a prime.

It is a super-3 number, since 3×87715139³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87715096 and 87715105.

It is not a weakly prime, because it can be changed into another prime (87715339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43857569 + 43857570.

It is an arithmetic number, because the mean of its divisors is an integer number (43857570).

Almost surely, 2^87715139 is an apocalyptic number.

87715139 is a deficient number, since it is larger than the sum of its proper divisors (1).

87715139 is an equidigital number, since it uses as much as digits as its factorization.

87715139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The square root of 87715139 is about 9365.6360702304. The cubic root of 87715139 is about 444.3155559849.

The spelling of 87715139 in words is "eighty-seven million, seven hundred fifteen thousand, one hundred thirty-nine".