31231434 has 32 divisors (see below), whose sum is σ = 69592320. Its totient is φ = 9277632.

The previous prime is 31231433. The next prime is 31231457. The reversal of 31231434 is 43413213.

It is a self number, because there is not a number n which added to its sum of digits gives 31231434.

It is not an unprimeable number, because it can be changed into a prime (31231433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4642 + ... + 9165.

It is an arithmetic number, because the mean of its divisors is an integer number (2174760).

Almost surely, 2^31231434 is an apocalyptic number.

31231434 is an abundant number, since it is smaller than the sum of its proper divisors (38360886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31231434 is a wasteful number, since it uses less digits than its factorization.

31231434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13854.

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

The square root of 31231434 is about 5588.5091035087. The cubic root of 31231434 is about 314.9178722653.

Adding to 31231434 its reverse (43413213), we get a palindrome (74644647).

The spelling of 31231434 in words is "thirty-one million, two hundred thirty-one thousand, four hundred thirty-four".