80645969 has 2 divisors, whose sum is σ = 80645970. Its totient is φ = 80645968.

The previous prime is 80645959. The next prime is 80646017. The reversal of 80645969 is 96954608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68674369 + 11971600 = 8287^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 80645969 - 2¹⁶ = 80580433 is a prime.

It is a super-2 number, since 2×80645969² = 13007544631897922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80645959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40322984 + 40322985.

It is an arithmetic number, because the mean of its divisors is an integer number (40322985).

Almost surely, 2^80645969 is an apocalyptic number.

It is an amenable number.

80645969 is a deficient number, since it is larger than the sum of its proper divisors (1).

80645969 is an equidigital number, since it uses as much as digits as its factorization.

80645969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 80645969 is about 8980.3100725977. The cubic root of 80645969 is about 432.0435787799.

The spelling of 80645969 in words is "eighty million, six hundred forty-five thousand, nine hundred sixty-nine".