82415591 has 2 divisors, whose sum is σ = 82415592. Its totient is φ = 82415590.

The previous prime is 82415569. The next prime is 82415621. The reversal of 82415591 is 19551428.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82415591 - 2⁶ = 82415527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82415191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41207795 + 41207796.

It is an arithmetic number, because the mean of its divisors is an integer number (41207796).

Almost surely, 2^82415591 is an apocalyptic number.

82415591 is a deficient number, since it is larger than the sum of its proper divisors (1).

82415591 is an equidigital number, since it uses as much as digits as its factorization.

82415591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 35.

The square root of 82415591 is about 9078.3033106413. The cubic root of 82415591 is about 435.1808663480.

The spelling of 82415591 in words is "eighty-two million, four hundred fifteen thousand, five hundred ninety-one".