79461989 has 2 divisors, whose sum is σ = 79461990. Its totient is φ = 79461988.

The previous prime is 79461953. The next prime is 79462027. The reversal of 79461989 is 98916497.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 7924225 = 8458^2 + 2815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79461989 is a prime.

It is a super-2 number, since 2×79461989² = 12628415391672242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79461989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79461289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39730994 + 39730995.

It is an arithmetic number, because the mean of its divisors is an integer number (39730995).

Almost surely, 2^79461989 is an apocalyptic number.

It is an amenable number.

79461989 is a deficient number, since it is larger than the sum of its proper divisors (1).

79461989 is an equidigital number, since it uses as much as digits as its factorization.

79461989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 79461989 is about 8914.1454441803. The cubic root of 79461989 is about 429.9188399195.

The spelling of 79461989 in words is "seventy-nine million, four hundred sixty-one thousand, nine hundred eighty-nine".