80639651 has 2 divisors, whose sum is σ = 80639652. Its totient is φ = 80639650.

The previous prime is 80639609. The next prime is 80639681. The reversal of 80639651 is 15693608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80639651 - 2¹⁰ = 80638627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80639681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40319825 + 40319826.

It is an arithmetic number, because the mean of its divisors is an integer number (40319826).

Almost surely, 2^80639651 is an apocalyptic number.

80639651 is a deficient number, since it is larger than the sum of its proper divisors (1).

80639651 is an equidigital number, since it uses as much as digits as its factorization.

80639651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 80639651 is about 8979.9582961170. The cubic root of 80639651 is about 432.0322960394.

The spelling of 80639651 in words is "eighty million, six hundred thirty-nine thousand, six hundred fifty-one".