85918251 has 4 divisors (see below), whose sum is σ = 114557672. Its totient is φ = 57278832.

The previous prime is 85918237. The next prime is 85918277. The reversal of 85918251 is 15281958.

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

It is not a de Polignac number, because 85918251 - 2⁷ = 85918123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85918211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14319706 + ... + 14319711.

It is an arithmetic number, because the mean of its divisors is an integer number (28639418).

Almost surely, 2^85918251 is an apocalyptic number.

85918251 is a deficient number, since it is larger than the sum of its proper divisors (28639421).

85918251 is a wasteful number, since it uses less digits than its factorization.

85918251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28639420.

The product of its digits is 28800, while the sum is 39.

The square root of 85918251 is about 9269.2098368739. The cubic root of 85918251 is about 441.2605912493.

It can be divided in two parts, 859 and 18251, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 85918251 in words is "eighty-five million, nine hundred eighteen thousand, two hundred fifty-one".