813887969 has 2 divisors, whose sum is σ = 813887970. Its totient is φ = 813887968.

The previous prime is 813887939. The next prime is 813888011. The reversal of 813887969 is 969788318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610682944 + 203205025 = 24712^2 + 14255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813887969 is a prime.

It is a super-2 number, since 2×813887969² = 1324827252165889922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (813887939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406943984 + 406943985.

It is an arithmetic number, because the mean of its divisors is an integer number (406943985).

Almost surely, 2^813887969 is an apocalyptic number.

It is an amenable number.

813887969 is a deficient number, since it is larger than the sum of its proper divisors (1).

813887969 is an equidigital number, since it uses as much as digits as its factorization.

813887969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 813887969 is about 28528.7218255568. The cubic root of 813887969 is about 933.6588315238.

The spelling of 813887969 in words is "eight hundred thirteen million, eight hundred eighty-seven thousand, nine hundred sixty-nine".