80626991 has 2 divisors, whose sum is σ = 80626992. Its totient is φ = 80626990.

The previous prime is 80626979. The next prime is 80627011. The reversal of 80626991 is 19962608.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80626991 - 2¹⁸ = 80364847 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 (80626901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40313495 + 40313496.

It is an arithmetic number, because the mean of its divisors is an integer number (40313496).

Almost surely, 2^80626991 is an apocalyptic number.

80626991 is a deficient number, since it is larger than the sum of its proper divisors (1).

80626991 is an equidigital number, since it uses as much as digits as its factorization.

80626991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 80626991 is about 8979.2533653974. The cubic root of 80626991 is about 432.0096859254.

The spelling of 80626991 in words is "eighty million, six hundred twenty-six thousand, nine hundred ninety-one".