31234431 has 4 divisors (see below), whose sum is σ = 41645912. Its totient is φ = 20822952.

The previous prime is 31234417. The next prime is 31234433. The reversal of 31234431 is 13443213.

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

It is not a de Polignac number, because 31234431 - 2⁷ = 31234303 is a prime.

It is a super-2 number, since 2×31234431² = 1951179359787522, 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 = 31234398 and 31234407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31234433) 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 3 ways as a sum of consecutive naturals, for example, 5205736 + ... + 5205741.

It is an arithmetic number, because the mean of its divisors is an integer number (10411478).

Almost surely, 2^31234431 is an apocalyptic number.

31234431 is a deficient number, since it is larger than the sum of its proper divisors (10411481).

31234431 is a wasteful number, since it uses less digits than its factorization.

31234431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411480.

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

The square root of 31234431 is about 5588.7772365697. Note that the first 3 decimals coincide. The cubic root of 31234431 is about 314.9279452223.

Adding to 31234431 its reverse (13443213), we get a palindrome (44677644).

It can be divided in two parts, 312 and 34431, that added together give a palindrome (34743).

The spelling of 31234431 in words is "thirty-one million, two hundred thirty-four thousand, four hundred thirty-one".