82815919 has 2 divisors, whose sum is σ = 82815920. Its totient is φ = 82815918.

The previous prime is 82815907. The next prime is 82815923. The reversal of 82815919 is 91951828.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82815919 - 2⁷ = 82815791 is a prime.

It is a super-2 number, since 2×82815919² = 13716952879629122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82815949) 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, 41407959 + 41407960.

It is an arithmetic number, because the mean of its divisors is an integer number (41407960).

Almost surely, 2^82815919 is an apocalyptic number.

82815919 is a deficient number, since it is larger than the sum of its proper divisors (1).

82815919 is an equidigital number, since it uses as much as digits as its factorization.

82815919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 43.

The square root of 82815919 is about 9100.3252139690. The cubic root of 82815919 is about 435.8843487971.

The spelling of 82815919 in words is "eighty-two million, eight hundred fifteen thousand, nine hundred nineteen".