82193691 has 16 divisors (see below), whose sum is σ = 117172224. Its totient is φ = 51068544.

The previous prime is 82193681. The next prime is 82193701. The reversal of 82193691 is 19639128.

It is an interprime number because it is at equal distance from previous prime (82193681) and next prime (82193701).

It is not a de Polignac number, because 82193691 - 2⁹ = 82193179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82193621) 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, 2571 + ... + 13076.

It is an arithmetic number, because the mean of its divisors is an integer number (7323264).

Almost surely, 2^82193691 is an apocalyptic number.

82193691 is a deficient number, since it is larger than the sum of its proper divisors (34978533).

82193691 is a wasteful number, since it uses less digits than its factorization.

82193691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15770.

The product of its digits is 23328, while the sum is 39.

The square root of 82193691 is about 9066.0736264383. The cubic root of 82193691 is about 434.7899474699.

The spelling of 82193691 in words is "eighty-two million, one hundred ninety-three thousand, six hundred ninety-one".