82172015 has 4 divisors (see below), whose sum is σ = 98606424. Its totient is φ = 65737608.

The previous prime is 82171967. The next prime is 82172021. The reversal of 82172015 is 51027128.

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

It is a cyclic number.

It is not a de Polignac number, because 82172015 - 2¹⁴ = 82155631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8217197 + ... + 8217206.

It is an arithmetic number, because the mean of its divisors is an integer number (24651606).

Almost surely, 2^82172015 is an apocalyptic number.

82172015 is a deficient number, since it is larger than the sum of its proper divisors (16434409).

82172015 is a wasteful number, since it uses less digits than its factorization.

82172015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16434408.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 82172015 is about 9064.8781017728. The cubic root of 82172015 is about 434.7517233865.

The spelling of 82172015 in words is "eighty-two million, one hundred seventy-two thousand, fifteen".