79985431 has 2 divisors, whose sum is σ = 79985432. Its totient is φ = 79985430.

The previous prime is 79985419. The next prime is 79985441. The reversal of 79985431 is 13458997.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13458997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79985431 - 2⁷ = 79985303 is a prime.

It is a super-2 number, since 2×79985431² = 12795338344511522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79985441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39992715 + 39992716.

It is an arithmetic number, because the mean of its divisors is an integer number (39992716).

Almost surely, 2^79985431 is an apocalyptic number.

79985431 is a deficient number, since it is larger than the sum of its proper divisors (1).

79985431 is an equidigital number, since it uses as much as digits as its factorization.

79985431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 79985431 is about 8943.4574410571. The cubic root of 79985431 is about 430.8607797859.

The spelling of 79985431 in words is "seventy-nine million, nine hundred eighty-five thousand, four hundred thirty-one".