815956873 has 2 divisors, whose sum is σ = 815956874. Its totient is φ = 815956872.

The previous prime is 815956853. The next prime is 815956903. The reversal of 815956873 is 378659518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 812706064 + 3250809 = 28508^2 + 1803^2 .

It is a cyclic number.

It is not a de Polignac number, because 815956873 - 2²¹ = 813859721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815956873.

It is not a weakly prime, because it can be changed into another prime (815956853) 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, 407978436 + 407978437.

It is an arithmetic number, because the mean of its divisors is an integer number (407978437).

Almost surely, 2^815956873 is an apocalyptic number.

It is an amenable number.

815956873 is a deficient number, since it is larger than the sum of its proper divisors (1).

815956873 is an equidigital number, since it uses as much as digits as its factorization.

815956873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 52.

The square root of 815956873 is about 28564.9588307072. The cubic root of 815956873 is about 934.4492826750.

The spelling of 815956873 in words is "eight hundred fifteen million, nine hundred fifty-six thousand, eight hundred seventy-three".