85663251 has 40 divisors (see below), whose sum is σ = 133194864. Its totient is φ = 54820800.

The previous prime is 85663241. The next prime is 85663271. The reversal of 85663251 is 15236658.

It is not a de Polignac number, because 85663251 - 2¹⁵ = 85630483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85663241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 302556 + ... + 302838.

Almost surely, 2^85663251 is an apocalyptic number.

85663251 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

85663251 is a deficient number, since it is larger than the sum of its proper divisors (47531613).

85663251 is a wasteful number, since it uses less digits than its factorization.

85663251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 424 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 85663251 is about 9255.4443977585. Note that the first 3 decimals coincide. The cubic root of 85663251 is about 440.8236140365.

The spelling of 85663251 in words is "eighty-five million, six hundred sixty-three thousand, two hundred fifty-one".