82170631 has 4 divisors (see below), whose sum is σ = 82924600. Its totient is φ = 81416664.

The previous prime is 82170589. The next prime is 82170653. The reversal of 82170631 is 13607128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82170631 is a prime.

It is a super-2 number, since 2×82170631² = 13504025197876322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82170631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82170661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376821 + ... + 377038.

It is an arithmetic number, because the mean of its divisors is an integer number (20731150).

Almost surely, 2^82170631 is an apocalyptic number.

82170631 is a deficient number, since it is larger than the sum of its proper divisors (753969).

82170631 is a wasteful number, since it uses less digits than its factorization.

82170631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753968.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 82170631 is about 9064.8017628628. The cubic root of 82170631 is about 434.7492825727.

Adding to 82170631 its reverse (13607128), we get a palindrome (95777759).

The spelling of 82170631 in words is "eighty-two million, one hundred seventy thousand, six hundred thirty-one".