85680131 has 2 divisors, whose sum is σ = 85680132. Its totient is φ = 85680130.

The previous prime is 85680073. The next prime is 85680149. The reversal of 85680131 is 13108658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85680131 is a prime.

It is a super-2 number, since 2×85680131² = 14682169696354322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85680631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42840065 + 42840066.

It is an arithmetic number, because the mean of its divisors is an integer number (42840066).

Almost surely, 2^85680131 is an apocalyptic number.

85680131 is a deficient number, since it is larger than the sum of its proper divisors (1).

85680131 is an equidigital number, since it uses as much as digits as its factorization.

85680131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 85680131 is about 9256.3562485462. The cubic root of 85680131 is about 440.8525669960.

Adding to 85680131 its reverse (13108658), we get a palindrome (98788789).

The spelling of 85680131 in words is "eighty-five million, six hundred eighty thousand, one hundred thirty-one".