82515231 has 6 divisors (see below), whose sum is σ = 119188680. Its totient is φ = 55010148.

The previous prime is 82515187. The next prime is 82515299. The reversal of 82515231 is 13251528.

It is a happy number.

It is not a de Polignac number, because 82515231 - 2²² = 78320927 is a prime.

It is a super-2 number, since 2×82515231² = 13617526693966722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 82515195 and 82515204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82515731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4584171 + ... + 4584188.

It is an arithmetic number, because the mean of its divisors is an integer number (19864780).

Almost surely, 2^82515231 is an apocalyptic number.

82515231 is a deficient number, since it is larger than the sum of its proper divisors (36673449).

82515231 is a wasteful number, since it uses less digits than its factorization.

82515231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168365 (or 9168362 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 82515231 is about 9083.7894625536. The cubic root of 82515231 is about 435.3561728167.

Adding to 82515231 its reverse (13251528), we get a palindrome (95766759).

The spelling of 82515231 in words is "eighty-two million, five hundred fifteen thousand, two hundred thirty-one".