31442331 has 16 divisors (see below), whose sum is σ = 43129856. Its totient is φ = 20363616.

The previous prime is 31442273. The next prime is 31442347. The reversal of 31442331 is 13324413.

It is not a de Polignac number, because 31442331 - 2²² = 27248027 is a prime.

It is a super-2 number, since 2×31442331² = 1977240357427122, 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 = 31442298 and 31442307.

It is not an unprimeable number, because it can be changed into a prime (31442381) 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 in 15 ways as a sum of consecutive naturals, for example, 28221 + ... + 29313.

It is an arithmetic number, because the mean of its divisors is an integer number (2695616).

Almost surely, 2^31442331 is an apocalyptic number.

31442331 is a deficient number, since it is larger than the sum of its proper divisors (11687525).

31442331 is a wasteful number, since it uses less digits than its factorization.

31442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362.

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

The square root of 31442331 is about 5607.3461637391. The cubic root of 31442331 is about 315.6251329738.

Adding to 31442331 its reverse (13324413), we get a palindrome (44766744).

The spelling of 31442331 in words is "thirty-one million, four hundred forty-two thousand, three hundred thirty-one".