74311631 has 4 divisors (see below), whose sum is σ = 74741352. Its totient is φ = 73881912.

The previous prime is 74311571. The next prime is 74311649. The reversal of 74311631 is 13611347.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74311631 is a prime.

It is a super-2 number, since 2×74311631² = 11044437003760322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74311631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74311661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214601 + ... + 214946.

It is an arithmetic number, because the mean of its divisors is an integer number (18685338).

Almost surely, 2^74311631 is an apocalyptic number.

74311631 is a deficient number, since it is larger than the sum of its proper divisors (429721).

74311631 is a wasteful number, since it uses less digits than its factorization.

74311631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429720.

The product of its digits is 1512, while the sum is 26.

The square root of 74311631 is about 8620.4194213507. The cubic root of 74311631 is about 420.4221586738.

Adding to 74311631 its reverse (13611347), we get a palindrome (87922978).

The spelling of 74311631 in words is "seventy-four million, three hundred eleven thousand, six hundred thirty-one".