815022139 has 2 divisors, whose sum is σ = 815022140. Its totient is φ = 815022138.

The previous prime is 815022137. The next prime is 815022163. The reversal of 815022139 is 931220518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815022139 - 2¹ = 815022137 is a prime.

It is a super-2 number, since 2×815022139² = 1328522174120270642, which contains 22 as substring.

Together with 815022137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 815022139.

It is not a weakly prime, because it can be changed into another prime (815022137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407511069 + 407511070.

It is an arithmetic number, because the mean of its divisors is an integer number (407511070).

Almost surely, 2^815022139 is an apocalyptic number.

815022139 is a deficient number, since it is larger than the sum of its proper divisors (1).

815022139 is an equidigital number, since it uses as much as digits as its factorization.

815022139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 815022139 is about 28548.5925922803. The cubic root of 815022139 is about 934.0923212989.

The spelling of 815022139 in words is "eight hundred fifteen million, twenty-two thousand, one hundred thirty-nine".