31121404 has 6 divisors (see below), whose sum is σ = 54462464. Its totient is φ = 15560700.

The previous prime is 31121401. The next prime is 31121413. The reversal of 31121404 is 40412113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890172 + ... + 3890179.

Almost surely, 2^31121404 is an apocalyptic number.

It is an amenable number.

31121404 is a deficient number, since it is larger than the sum of its proper divisors (23341060).

31121404 is a wasteful number, since it uses less digits than its factorization.

31121404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780355 (or 7780353 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31121404 is about 5578.6561105700. The cubic root of 31121404 is about 314.5476129824.

Adding to 31121404 its reverse (40412113), we get a palindrome (71533517).

The spelling of 31121404 in words is "thirty-one million, one hundred twenty-one thousand, four hundred four".