82151997 has 8 divisors (see below), whose sum is σ = 109585344. Its totient is φ = 54743328.

The previous prime is 82151969. The next prime is 82152001. The reversal of 82151997 is 79915128.

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

It is not a de Polignac number, because 82151997 - 2⁷ = 82151869 is a prime.

It is a super-2 number, since 2×82151997² = 13497901222176018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82151917) 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, 3993 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (13698168).

Almost surely, 2^82151997 is an apocalyptic number.

It is an amenable number.

82151997 is a deficient number, since it is larger than the sum of its proper divisors (27433347).

82151997 is a wasteful number, since it uses less digits than its factorization.

82151997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12339.

The product of its digits is 45360, while the sum is 42.

The square root of 82151997 is about 9063.7738828812. The cubic root of 82151997 is about 434.7164170972.

The spelling of 82151997 in words is "eighty-two million, one hundred fifty-one thousand, nine hundred ninety-seven".