82172091 has 8 divisors (see below), whose sum is σ = 109618704. Its totient is φ = 54753440.

The previous prime is 82172081. The next prime is 82172099. The reversal of 82172091 is 19027128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82172091 - 2⁷ = 82171963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82172099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 12881.

It is an arithmetic number, because the mean of its divisors is an integer number (13702338).

Almost surely, 2^82172091 is an apocalyptic number.

82172091 is a deficient number, since it is larger than the sum of its proper divisors (27446613).

82172091 is a wasteful number, since it uses less digits than its factorization.

82172091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13981.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 82172091 is about 9064.8822937752. The cubic root of 82172091 is about 434.7518574188.

The spelling of 82172091 in words is "eighty-two million, one hundred seventy-two thousand, ninety-one".