82163691 has 6 divisors (see below), whose sum is σ = 118680900. Its totient is φ = 54775788.

The previous prime is 82163689. The next prime is 82163693. The reversal of 82163691 is 19636128.

It is an interprime number because it is at equal distance from previous prime (82163689) and next prime (82163693).

It is not a de Polignac number, because 82163691 - 2¹ = 82163689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82163693) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4564641 + ... + 4564658.

It is an arithmetic number, because the mean of its divisors is an integer number (19780150).

Almost surely, 2^82163691 is an apocalyptic number.

82163691 is a deficient number, since it is larger than the sum of its proper divisors (36517209).

82163691 is a wasteful number, since it uses less digits than its factorization.

82163691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9129305 (or 9129302 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 82163691 is about 9064.4189554543. The cubic root of 82163691 is about 434.7370428186.

The spelling of 82163691 in words is "eighty-two million, one hundred sixty-three thousand, six hundred ninety-one".