87138497 has 2 divisors, whose sum is σ = 87138498. Its totient is φ = 87138496.

The previous prime is 87138479. The next prime is 87138523. The reversal of 87138497 is 79483178.

Together with previous prime (87138479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71842576 + 15295921 = 8476^2 + 3911^2 .

It is a cyclic number.

It is not a de Polignac number, because 87138497 - 2⁶ = 87138433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87138437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43569248 + 43569249.

It is an arithmetic number, because the mean of its divisors is an integer number (43569249).

Almost surely, 2^87138497 is an apocalyptic number.

It is an amenable number.

87138497 is a deficient number, since it is larger than the sum of its proper divisors (1).

87138497 is an equidigital number, since it uses as much as digits as its factorization.

87138497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 87138497 is about 9334.8003192355. The cubic root of 87138497 is about 443.3397665538.

The spelling of 87138497 in words is "eighty-seven million, one hundred thirty-eight thousand, four hundred ninety-seven".