31320130 has 16 divisors (see below), whose sum is σ = 57900600. Its totient is φ = 12189312.

The previous prime is 31320109. The next prime is 31320173. The reversal of 31320130 is 3102313.

It can be written as a sum of positive squares in 4 ways, for example, as 25979409 + 5340721 = 5097^2 + 2311^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31320130.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41955 + ... + 42694.

Almost surely, 2^31320130 is an apocalyptic number.

31320130 is a deficient number, since it is larger than the sum of its proper divisors (26580470).

31320130 is a wasteful number, since it uses less digits than its factorization.

31320130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84693.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31320130 is about 5596.4390463937. The cubic root of 31320130 is about 315.2157084706.

Adding to 31320130 its reverse (3102313), we get a palindrome (34422443).

The spelling of 31320130 in words is "thirty-one million, three hundred twenty thousand, one hundred thirty".