31302130 has 16 divisors (see below), whose sum is σ = 56844504. Its totient is φ = 12409600.

The previous prime is 31302121. The next prime is 31302137. The reversal of 31302130 is 3120313.

It can be written as a sum of positive squares in 4 ways, for example, as 14220441 + 17081689 = 3771^2 + 4133^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31302130.

It is not an unprimeable number, because it can be changed into a prime (31302137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12721 + ... + 14980.

Almost surely, 2^31302130 is an apocalyptic number.

31302130 is a deficient number, since it is larger than the sum of its proper divisors (25542374).

31302130 is a wasteful number, since it uses less digits than its factorization.

31302130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27821.

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

The square root of 31302130 is about 5594.8306498052. The cubic root of 31302130 is about 315.1553109983.

Adding to 31302130 its reverse (3120313), we get a palindrome (34422443).

The spelling of 31302130 in words is "thirty-one million, three hundred two thousand, one hundred thirty".