31042431 has 36 divisors (see below), whose sum is σ = 53405352. Its totient is φ = 17315424.

The previous prime is 31042421. The next prime is 31042457. The reversal of 31042431 is 13424013.

It is not a de Polignac number, because 31042431 - 2⁶ = 31042367 is a prime.

It is a super-2 number, since 2×31042431² = 1927265044779522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31042421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18145 + ... + 19781.

It is an arithmetic number, because the mean of its divisors is an integer number (1483482).

Almost surely, 2^31042431 is an apocalyptic number.

31042431 is a deficient number, since it is larger than the sum of its proper divisors (22362921).

31042431 is a wasteful number, since it uses less digits than its factorization.

31042431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700 (or 1690 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31042431 is about 5571.5734761376. The cubic root of 31042431 is about 314.2813245451.

Adding to 31042431 its reverse (13424013), we get a palindrome (44466444).

The spelling of 31042431 in words is "thirty-one million, forty-two thousand, four hundred thirty-one".