82911531 has 4 divisors (see below), whose sum is σ = 110548712. Its totient is φ = 55274352.

The previous prime is 82911503. The next prime is 82911571. The reversal of 82911531 is 13511928.

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

It is not a de Polignac number, because 82911531 - 2⁶ = 82911467 is a prime.

It is a super-2 number, since 2×82911531² = 13748643945527922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82911571) 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, 13818586 + ... + 13818591.

It is an arithmetic number, because the mean of its divisors is an integer number (27637178).

Almost surely, 2^82911531 is an apocalyptic number.

82911531 is a deficient number, since it is larger than the sum of its proper divisors (27637181).

82911531 is a wasteful number, since it uses less digits than its factorization.

82911531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27637180.

The product of its digits is 2160, while the sum is 30.

The square root of 82911531 is about 9105.5769174721. The cubic root of 82911531 is about 436.0520289031.

The spelling of 82911531 in words is "eighty-two million, nine hundred eleven thousand, five hundred thirty-one".