80645731 has 2 divisors, whose sum is σ = 80645732. Its totient is φ = 80645730.

The previous prime is 80645687. The next prime is 80645753. The reversal of 80645731 is 13754608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80645731 - 2⁹ = 80645219 is a prime.

It is a super-2 number, since 2×80645731² = 13007467857048722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80645791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40322865 + 40322866.

It is an arithmetic number, because the mean of its divisors is an integer number (40322866).

Almost surely, 2^80645731 is an apocalyptic number.

80645731 is a deficient number, since it is larger than the sum of its proper divisors (1).

80645731 is an equidigital number, since it uses as much as digits as its factorization.

80645731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 80645731 is about 8980.2968213751. The cubic root of 80645731 is about 432.0431537681.

The spelling of 80645731 in words is "eighty million, six hundred forty-five thousand, seven hundred thirty-one".