87291697 has 2 divisors, whose sum is σ = 87291698. Its totient is φ = 87291696.

The previous prime is 87291661. The next prime is 87291713. The reversal of 87291697 is 79619278.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43678881 + 43612816 = 6609^2 + 6604^2 .

It is a cyclic number.

It is not a de Polignac number, because 87291697 - 2²³ = 78903089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87291697.

It is not a weakly prime, because it can be changed into another prime (87291397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43645848 + 43645849.

It is an arithmetic number, because the mean of its divisors is an integer number (43645849).

Almost surely, 2^87291697 is an apocalyptic number.

It is an amenable number.

87291697 is a deficient number, since it is larger than the sum of its proper divisors (1).

87291697 is an equidigital number, since it uses as much as digits as its factorization.

87291697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 49.

The square root of 87291697 is about 9343.0025687677. The cubic root of 87291697 is about 443.5994293885.

The spelling of 87291697 in words is "eighty-seven million, two hundred ninety-one thousand, six hundred ninety-seven".