82155931 has 16 divisors (see below), whose sum is σ = 100719360. Its totient is φ = 65941920.

The previous prime is 82155911. The next prime is 82155949. The reversal of 82155931 is 13955128.

It is not a de Polignac number, because 82155931 - 2⁷ = 82155803 is a prime.

It is a super-2 number, since 2×82155931² = 13499193996953522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82155911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9201 + ... + 15778.

It is an arithmetic number, because the mean of its divisors is an integer number (6294960).

Almost surely, 2^82155931 is an apocalyptic number.

82155931 is a deficient number, since it is larger than the sum of its proper divisors (18563429).

82155931 is a wasteful number, since it uses less digits than its factorization.

82155931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25026.

The product of its digits is 10800, while the sum is 34.

The square root of 82155931 is about 9063.9908980537. The cubic root of 82155931 is about 434.7233560525.

The spelling of 82155931 in words is "eighty-two million, one hundred fifty-five thousand, nine hundred thirty-one".