31323130 has 16 divisors (see below), whose sum is σ = 56941704. Its totient is φ = 12404800.

The previous prime is 31323107. The next prime is 31323133. The reversal of 31323130 is 3132313.

It can be written as a sum of positive squares in 4 ways, for example, as 22953681 + 8369449 = 4791^2 + 2893^2 .

It is a super-2 number, since 2×31323130² = 1962276945993800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31323133) 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 in 7 ways as a sum of consecutive naturals, for example, 14497 + ... + 16516.

Almost surely, 2^31323130 is an apocalyptic number.

31323130 is a deficient number, since it is larger than the sum of its proper divisors (25618574).

31323130 is a wasteful number, since it uses less digits than its factorization.

31323130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31121.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 31323130 is about 5596.7070675532. The cubic root of 31323130 is about 315.2257724660.

Adding to 31323130 its reverse (3132313), we get a palindrome (34455443).

The spelling of 31323130 in words is "thirty-one million, three hundred twenty-three thousand, one hundred thirty".