31130402 has 4 divisors (see below), whose sum is σ = 46695606. Its totient is φ = 15565200.

The previous prime is 31130399. The next prime is 31130419. The reversal of 31130402 is 20403113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20403113 = 43 ⋅474491.

It can be written as a sum of positive squares in only one way, i.e., 26512201 + 4618201 = 5149^2 + 2149^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782599 + ... + 7782602.

Almost surely, 2^31130402 is an apocalyptic number.

31130402 is a deficient number, since it is larger than the sum of its proper divisors (15565204).

31130402 is a wasteful number, since it uses less digits than its factorization.

31130402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15565203.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31130402 is about 5579.4625189170. The cubic root of 31130402 is about 314.5779246686.

Adding to 31130402 its reverse (20403113), we get a palindrome (51533515).

The spelling of 31130402 in words is "thirty-one million, one hundred thirty thousand, four hundred two".