31121002 has 16 divisors (see below), whose sum is σ = 52682400. Its totient is φ = 13657840.

The previous prime is 31120997. The next prime is 31121021. The reversal of 31121002 is 20012113.

It is a self number, because there is not a number n which added to its sum of digits gives 31121002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23752 + ... + 25027.

It is an arithmetic number, because the mean of its divisors is an integer number (3292650).

Almost surely, 2^31121002 is an apocalyptic number.

31121002 is a deficient number, since it is larger than the sum of its proper divisors (21561398).

31121002 is a wasteful number, since it uses less digits than its factorization.

31121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48821.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 31121002 is about 5578.6200802707. The cubic root of 31121002 is about 314.5462586232.

Adding to 31121002 its reverse (20012113), we get a palindrome (51133115).

Subtracting from 31121002 its reverse (20012113), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 3112 and 1002, that added together give a palindrome (4114).

The spelling of 31121002 in words is "thirty-one million, one hundred twenty-one thousand, two".