813980969 has 2 divisors, whose sum is σ = 813980970. Its totient is φ = 813980968.

The previous prime is 813980963. The next prime is 813980983. The reversal of 813980969 is 969089318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 754875625 + 59105344 = 27475^2 + 7688^2 .

It is a cyclic number.

It is not a de Polignac number, because 813980969 - 2²⁴ = 797203753 is a prime.

It is a super-2 number, since 2×813980969² = 1325130035788357922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813980969.

It is not a weakly prime, because it can be changed into another prime (813980963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406990484 + 406990485.

It is an arithmetic number, because the mean of its divisors is an integer number (406990485).

Almost surely, 2^813980969 is an apocalyptic number.

It is an amenable number.

813980969 is a deficient number, since it is larger than the sum of its proper divisors (1).

813980969 is an equidigital number, since it uses as much as digits as its factorization.

813980969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 813980969 is about 28530.3517153224. The cubic root of 813980969 is about 933.6943920954.

The spelling of 813980969 in words is "eight hundred thirteen million, nine hundred eighty thousand, nine hundred sixty-nine".