79551631 has 2 divisors, whose sum is σ = 79551632. Its totient is φ = 79551630.

The previous prime is 79551617. The next prime is 79551649. The reversal of 79551631 is 13615597.

It is a weak prime.

It is an emirp because it is prime and its reverse (13615597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79551631 - 2¹¹ = 79549583 is a prime.

It is a super-2 number, since 2×79551631² = 12656923989520322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79551601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39775815 + 39775816.

It is an arithmetic number, because the mean of its divisors is an integer number (39775816).

Almost surely, 2^79551631 is an apocalyptic number.

79551631 is a deficient number, since it is larger than the sum of its proper divisors (1).

79551631 is an equidigital number, since it uses as much as digits as its factorization.

79551631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 79551631 is about 8919.1721028356. The cubic root of 79551631 is about 430.0804446574.

The spelling of 79551631 in words is "seventy-nine million, five hundred fifty-one thousand, six hundred thirty-one".