82531515 has 32 divisors (see below), whose sum is σ = 152534016. Its totient is φ = 37660160.

The previous prime is 82531513. The next prime is 82531523. The reversal of 82531515 is 51513528.

It is not a de Polignac number, because 82531515 - 2¹ = 82531513 is a prime.

It is a super-2 number, since 2×82531515² = 13622901936390450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82531511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11907 + ... + 17516.

It is an arithmetic number, because the mean of its divisors is an integer number (4766688).

Almost surely, 2^82531515 is an apocalyptic number.

82531515 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

82531515 is a deficient number, since it is larger than the sum of its proper divisors (70002501).

82531515 is a wasteful number, since it uses less digits than its factorization.

82531515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29459.

The product of its digits is 6000, while the sum is 30.

The square root of 82531515 is about 9084.6857402994. The cubic root of 82531515 is about 435.3848094435.

The spelling of 82531515 in words is "eighty-two million, five hundred thirty-one thousand, five hundred fifteen".