80291989 has 2 divisors, whose sum is σ = 80291990. Its totient is φ = 80291988.

The previous prime is 80291977. The next prime is 80291993. The reversal of 80291989 is 98919208.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80245764 + 46225 = 8958^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 80291989 - 2²⁵ = 46737557 is a prime.

It is a super-2 number, since 2×80291989² = 12893606995152242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80291089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40145994 + 40145995.

It is an arithmetic number, because the mean of its divisors is an integer number (40145995).

Almost surely, 2^80291989 is an apocalyptic number.

It is an amenable number.

80291989 is a deficient number, since it is larger than the sum of its proper divisors (1).

80291989 is an equidigital number, since it uses as much as digits as its factorization.

80291989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 80291989 is about 8960.5797245491. The cubic root of 80291989 is about 431.4105275378.

The spelling of 80291989 in words is "eighty million, two hundred ninety-one thousand, nine hundred eighty-nine".