31231125542 has 4 divisors (see below), whose sum is σ = 46846688316. Its totient is φ = 15615562770.

The previous prime is 31231125539. The next prime is 31231125557. The reversal of 31231125542 is 24552113213.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807781384 + ... + 7807781387.

It is an arithmetic number, because the mean of its divisors is an integer number (11711672079).

Almost surely, 2^31231125542 is an apocalyptic number.

31231125542 is a deficient number, since it is larger than the sum of its proper divisors (15615562774).

31231125542 is a wasteful number, since it uses less digits than its factorization.

31231125542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615562773.

The product of its digits is 7200, while the sum is 29.

Adding to 31231125542 its reverse (24552113213), we get a palindrome (55783238755).

The spelling of 31231125542 in words is "thirty-one billion, two hundred thirty-one million, one hundred twenty-five thousand, five hundred forty-two".