31123331002 has 4 divisors (see below), whose sum is σ = 46684996506. Its totient is φ = 15561665500.

The previous prime is 31123330999. The next prime is 31123331027. The reversal of 31123331002 is 20013332113.

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

It can be written as a sum of positive squares in only one way, i.e., 30390600241 + 732730761 = 174329^2 + 27069^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780832749 + ... + 7780832752.

Almost surely, 2^31123331002 is an apocalyptic number.

31123331002 is a deficient number, since it is larger than the sum of its proper divisors (15561665504).

31123331002 is a wasteful number, since it uses less digits than its factorization.

31123331002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15561665503.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31123331002 its reverse (20013332113), we get a palindrome (51136663115).

The spelling of 31123331002 in words is "thirty-one billion, one hundred twenty-three million, three hundred thirty-one thousand, two".