74991631 has 16 divisors (see below), whose sum is σ = 89556768. Its totient is φ = 61891200.

The previous prime is 74991617. The next prime is 74991643. The reversal of 74991631 is 13619947.

It is a cyclic number.

It is not a de Polignac number, because 74991631 - 2¹³ = 74983439 is a prime.

It is a super-2 number, since 2×74991631² = 11247489440080322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74991611) 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 in 15 ways as a sum of consecutive naturals, for example, 4425 + ... + 13021.

It is an arithmetic number, because the mean of its divisors is an integer number (5597298).

Almost surely, 2^74991631 is an apocalyptic number.

74991631 is a deficient number, since it is larger than the sum of its proper divisors (14565137).

74991631 is a wasteful number, since it uses less digits than its factorization.

74991631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8682.

The product of its digits is 40824, while the sum is 40.

The square root of 74991631 is about 8659.7708399241. The cubic root of 74991631 is about 421.7006460941.

It can be divided in two parts, 749916 and 31, that added together give a palindrome (749947).

The spelling of 74991631 in words is "seventy-four million, nine hundred ninety-one thousand, six hundred thirty-one".