646462969 has 2 divisors, whose sum is σ = 646462970. Its totient is φ = 646462968.

The previous prime is 646462931. The next prime is 646462991. The reversal of 646462969 is 969264646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527391225 + 119071744 = 22965^2 + 10912^2 .

It is a cyclic number.

It is not a de Polignac number, because 646462969 - 2¹⁷ = 646331897 is a prime.

It is a super-2 number, since 2×646462969² = 835828740576589922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646402969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323231484 + 323231485.

It is an arithmetic number, because the mean of its divisors is an integer number (323231485).

Almost surely, 2^646462969 is an apocalyptic number.

It is an amenable number.

646462969 is a deficient number, since it is larger than the sum of its proper divisors (1).

646462969 is an equidigital number, since it uses as much as digits as its factorization.

646462969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 52.

The square root of 646462969 is about 25425.6360589072. The cubic root of 646462969 is about 864.6650084437.

The spelling of 646462969 in words is "six hundred forty-six million, four hundred sixty-two thousand, nine hundred sixty-nine".