80801989 has 2 divisors, whose sum is σ = 80801990. Its totient is φ = 80801988.

The previous prime is 80801971. The next prime is 80802017. The reversal of 80801989 is 98910808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77739489 + 3062500 = 8817^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 80801989 - 2¹⁷ = 80670917 is a prime.

It is a super-2 number, since 2×80801989² = 13057922852712242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80801689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40400994 + 40400995.

It is an arithmetic number, because the mean of its divisors is an integer number (40400995).

Almost surely, 2^80801989 is an apocalyptic number.

It is an amenable number.

80801989 is a deficient number, since it is larger than the sum of its proper divisors (1).

80801989 is an equidigital number, since it uses as much as digits as its factorization.

80801989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 80801989 is about 8988.9926576897. The cubic root of 80801989 is about 432.3220139255.

The spelling of 80801989 in words is "eighty million, eight hundred one thousand, nine hundred eighty-nine".