85958981 has 4 divisors (see below), whose sum is σ = 89696352. Its totient is φ = 82221612.

The previous prime is 85958963. The next prime is 85958993. The reversal of 85958981 is 18985958.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85958981 is a prime.

It is a super-2 number, since 2×85958981² = 14777892829116722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85958921) 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 3 ways as a sum of consecutive naturals, for example, 1868651 + ... + 1868696.

It is an arithmetic number, because the mean of its divisors is an integer number (22424088).

Almost surely, 2^85958981 is an apocalyptic number.

It is an amenable number.

85958981 is a deficient number, since it is larger than the sum of its proper divisors (3737371).

85958981 is a wasteful number, since it uses less digits than its factorization.

85958981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737370.

The product of its digits is 1036800, while the sum is 53.

The square root of 85958981 is about 9271.4066354572. The cubic root of 85958981 is about 441.3303075375.

It can be divided in two parts, 8595 and 8981, that added together give a cube (17576 = 26³).

The spelling of 85958981 in words is "eighty-five million, nine hundred fifty-eight thousand, nine hundred eighty-one".