31424861 has 4 divisors (see below), whose sum is σ = 33842172. Its totient is φ = 29007552.

The previous prime is 31424807. The next prime is 31424867. The reversal of 31424861 is 16842413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4280761 + 27144100 = 2069^2 + 5210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31424861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424867) 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, 1208636 + ... + 1208661.

It is an arithmetic number, because the mean of its divisors is an integer number (8460543).

Almost surely, 2^31424861 is an apocalyptic number.

It is an amenable number.

31424861 is a deficient number, since it is larger than the sum of its proper divisors (2417311).

31424861 is a wasteful number, since it uses less digits than its factorization.

31424861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417310.

The product of its digits is 4608, while the sum is 29.

The square root of 31424861 is about 5605.7881693835. The cubic root of 31424861 is about 315.5666662249.

The spelling of 31424861 in words is "thirty-one million, four hundred twenty-four thousand, eight hundred sixty-one".