82312591 has 2 divisors, whose sum is σ = 82312592. Its totient is φ = 82312590.

The previous prime is 82312567. The next prime is 82312619. The reversal of 82312591 is 19521328.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82312591 - 2¹³ = 82304399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82312091) 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 as a sum of consecutive naturals, namely, 41156295 + 41156296.

It is an arithmetic number, because the mean of its divisors is an integer number (41156296).

Almost surely, 2^82312591 is an apocalyptic number.

82312591 is a deficient number, since it is larger than the sum of its proper divisors (1).

82312591 is an equidigital number, since it uses as much as digits as its factorization.

82312591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 82312591 is about 9072.6286708980. The cubic root of 82312591 is about 434.9994997132. Note that the first 3 decimals are identical.

The spelling of 82312591 in words is "eighty-two million, three hundred twelve thousand, five hundred ninety-one".