31530130 has 16 divisors (see below), whose sum is σ = 56819520. Its totient is φ = 12597552.

The previous prime is 31530097. The next prime is 31530143. The reversal of 31530130 is 3103513.

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 in 7 ways as a sum of consecutive naturals, for example, 13381 + ... + 15559.

It is an arithmetic number, because the mean of its divisors is an integer number (3551220).

Almost surely, 2^31530130 is an apocalyptic number.

31530130 is a deficient number, since it is larger than the sum of its proper divisors (25289390).

31530130 is a wasteful number, since it uses less digits than its factorization.

31530130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633.

The product of its (nonzero) digits is 135, while the sum is 16.

The square root of 31530130 is about 5615.1696323442. The cubic root of 31530130 is about 315.9186419297.

Adding to 31530130 its reverse (3103513), we get a palindrome (34633643).

The spelling of 31530130 in words is "thirty-one million, five hundred thirty thousand, one hundred thirty".