85631251 has 4 divisors (see below), whose sum is σ = 87035104. Its totient is φ = 84227400.

The previous prime is 85631239. The next prime is 85631257. The reversal of 85631251 is 15213658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85631251 - 2⁵ = 85631219 is a prime.

It is a super-2 number, since 2×85631251² = 14665422295650002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85631257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701835 + ... + 701956.

It is an arithmetic number, because the mean of its divisors is an integer number (21758776).

Almost surely, 2^85631251 is an apocalyptic number.

85631251 is a deficient number, since it is larger than the sum of its proper divisors (1403853).

85631251 is a wasteful number, since it uses less digits than its factorization.

85631251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403852.

The product of its digits is 7200, while the sum is 31.

The square root of 85631251 is about 9253.7155240476. The cubic root of 85631251 is about 440.7687164682.

The spelling of 85631251 in words is "eighty-five million, six hundred thirty-one thousand, two hundred fifty-one".