82557431 has 4 divisors (see below), whose sum is σ = 90062664. Its totient is φ = 75052200.

The previous prime is 82557407. The next prime is 82557439. The reversal of 82557431 is 13475528.

It is a happy number.

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-82557431 is a prime.

It is a super-2 number, since 2×82557431² = 13631458826639522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82557391 and 82557400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82557439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3752600 + ... + 3752621.

It is an arithmetic number, because the mean of its divisors is an integer number (22515666).

Almost surely, 2^82557431 is an apocalyptic number.

82557431 is a deficient number, since it is larger than the sum of its proper divisors (7505233).

82557431 is a wasteful number, since it uses less digits than its factorization.

82557431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7505232.

The product of its digits is 33600, while the sum is 35.

The square root of 82557431 is about 9086.1119847820. Note that the first 3 decimals coincide. The cubic root of 82557431 is about 435.4303768928.

The spelling of 82557431 in words is "eighty-two million, five hundred fifty-seven thousand, four hundred thirty-one".