85687997 has 2 divisors, whose sum is σ = 85687998. Its totient is φ = 85687996.

The previous prime is 85687933. The next prime is 85688021. The reversal of 85687997 is 79978658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72914521 + 12773476 = 8539^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 85687997 - 2⁶ = 85687933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85687097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42843998 + 42843999.

It is an arithmetic number, because the mean of its divisors is an integer number (42843999).

Almost surely, 2^85687997 is an apocalyptic number.

It is an amenable number.

85687997 is a deficient number, since it is larger than the sum of its proper divisors (1).

85687997 is an equidigital number, since it uses as much as digits as its factorization.

85687997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 85687997 is about 9256.7811360105. The cubic root of 85687997 is about 440.8660576390.

The spelling of 85687997 in words is "eighty-five million, six hundred eighty-seven thousand, nine hundred ninety-seven".