80645951 has 2 divisors, whose sum is σ = 80645952. Its totient is φ = 80645950.

The previous prime is 80645933. The next prime is 80645959. The reversal of 80645951 is 15954608.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80645951 is a prime.

It is a Chen prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40322975 + 40322976.

It is an arithmetic number, because the mean of its divisors is an integer number (40322976).

Almost surely, 2^80645951 is an apocalyptic number.

80645951 is a deficient number, since it is larger than the sum of its proper divisors (1).

80645951 is an equidigital number, since it uses as much as digits as its factorization.

80645951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 80645951 is about 8980.3090704051. The cubic root of 80645951 is about 432.0435466362.

The spelling of 80645951 in words is "eighty million, six hundred forty-five thousand, nine hundred fifty-one".