815120039 has 2 divisors, whose sum is σ = 815120040. Its totient is φ = 815120038.

The previous prime is 815120021. The next prime is 815120071. The reversal of 815120039 is 930021518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815120039 - 2⁸ = 815119783 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 815119993 and 815120020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815120099) 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, 407560019 + 407560020.

It is an arithmetic number, because the mean of its divisors is an integer number (407560020).

Almost surely, 2^815120039 is an apocalyptic number.

815120039 is a deficient number, since it is larger than the sum of its proper divisors (1).

815120039 is an equidigital number, since it uses as much as digits as its factorization.

815120039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 815120039 is about 28550.3071612198. The cubic root of 815120039 is about 934.1297206826.

The spelling of 815120039 in words is "eight hundred fifteen million, one hundred twenty thousand, thirty-nine".