80634989 has 2 divisors, whose sum is σ = 80634990. Its totient is φ = 80634988.

The previous prime is 80634949. The next prime is 80634991. The reversal of 80634989 is 98943608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41822089 + 38812900 = 6467^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 80634989 - 2⁸ = 80634733 is a prime.

Together with 80634991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80634919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40317494 + 40317495.

It is an arithmetic number, because the mean of its divisors is an integer number (40317495).

Almost surely, 2^80634989 is an apocalyptic number.

It is an amenable number.

80634989 is a deficient number, since it is larger than the sum of its proper divisors (1).

80634989 is an equidigital number, since it uses as much as digits as its factorization.

80634989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 80634989 is about 8979.6987143222. The cubic root of 80634989 is about 432.0239702206.

The spelling of 80634989 in words is "eighty million, six hundred thirty-four thousand, nine hundred eighty-nine".