82212531 has 4 divisors (see below), whose sum is σ = 109616712. Its totient is φ = 54808352.

The previous prime is 82212521. The next prime is 82212569. The reversal of 82212531 is 13521228.

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 82212531 - 2⁵ = 82212499 is a prime.

It is a super-2 number, since 2×82212531² = 13517800506851922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82212521) 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, 13702086 + ... + 13702091.

It is an arithmetic number, because the mean of its divisors is an integer number (27404178).

Almost surely, 2^82212531 is an apocalyptic number.

82212531 is a deficient number, since it is larger than the sum of its proper divisors (27404181).

82212531 is a wasteful number, since it uses less digits than its factorization.

82212531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27404180.

The product of its digits is 960, while the sum is 24.

The square root of 82212531 is about 9067.1126054549. The cubic root of 82212531 is about 434.8231650106.

Adding to 82212531 its reverse (13521228), we get a palindrome (95733759).

The spelling of 82212531 in words is "eighty-two million, two hundred twelve thousand, five hundred thirty-one".