31424331 has 4 divisors (see below), whose sum is σ = 41899112. Its totient is φ = 20949552.

The previous prime is 31424329. The next prime is 31424353. The reversal of 31424331 is 13342413.

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

It is not a de Polignac number, because 31424331 - 2¹ = 31424329 is a prime.

It is a super-2 number, since 2×31424331² = 1974977157595122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31424298 and 31424307.

It is not an unprimeable number, because it can be changed into a prime (31424321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5237386 + ... + 5237391.

It is an arithmetic number, because the mean of its divisors is an integer number (10474778).

Almost surely, 2^31424331 is an apocalyptic number.

31424331 is a deficient number, since it is larger than the sum of its proper divisors (10474781).

31424331 is a wasteful number, since it uses less digits than its factorization.

31424331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10474780.

The product of its digits is 864, while the sum is 21.

The square root of 31424331 is about 5605.7408966166. The cubic root of 31424331 is about 315.5648921384.

Adding to 31424331 its reverse (13342413), we get a palindrome (44766744).

The spelling of 31424331 in words is "thirty-one million, four hundred twenty-four thousand, three hundred thirty-one".