85911511 has 12 divisors (see below), whose sum is σ = 99189552. Its totient is φ = 72892224.

The previous prime is 85911481. The next prime is 85911541. The reversal of 85911511 is 11511958.

It is an interprime number because it is at equal distance from previous prime (85911481) and next prime (85911541).

It is not a de Polignac number, because 85911511 - 2⁵ = 85911479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85911541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82651 + ... + 83683.

It is an arithmetic number, because the mean of its divisors is an integer number (8265796).

Almost surely, 2^85911511 is an apocalyptic number.

85911511 is a deficient number, since it is larger than the sum of its proper divisors (13278041).

85911511 is a wasteful number, since it uses less digits than its factorization.

85911511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258 (or 1149 counting only the distinct ones).

The product of its digits is 1800, while the sum is 31.

The square root of 85911511 is about 9268.8462604577. The cubic root of 85911511 is about 441.2490524741.

The spelling of 85911511 in words is "eighty-five million, nine hundred eleven thousand, five hundred eleven".