82512681 has 4 divisors (see below), whose sum is σ = 110016912. Its totient is φ = 55008452.

The previous prime is 82512671. The next prime is 82512709. The reversal of 82512681 is 18621528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82512681 - 2¹⁰ = 82511657 is a prime.

It is a super-2 number, since 2×82512681² = 13616685051615522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82512601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13752111 + ... + 13752116.

It is an arithmetic number, because the mean of its divisors is an integer number (27504228).

Almost surely, 2^82512681 is an apocalyptic number.

It is an amenable number.

82512681 is a deficient number, since it is larger than the sum of its proper divisors (27504231).

82512681 is a wasteful number, since it uses less digits than its factorization.

82512681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27504230.

The product of its digits is 7680, while the sum is 33.

The square root of 82512681 is about 9083.6491015450. The cubic root of 82512681 is about 435.3516881106.

The spelling of 82512681 in words is "eighty-two million, five hundred twelve thousand, six hundred eighty-one".