31372130 has 16 divisors (see below), whose sum is σ = 56592000. Its totient is φ = 12521712.

The previous prime is 31372111. The next prime is 31372139. The reversal of 31372130 is 3127313.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31372139) 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, 1847 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (3537000).

Almost surely, 2^31372130 is an apocalyptic number.

31372130 is a deficient number, since it is larger than the sum of its proper divisors (25219870).

31372130 is a wasteful number, since it uses less digits than its factorization.

31372130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 31372130 is about 5601.0829310054. The cubic root of 31372130 is about 315.3900601723.

Adding to 31372130 its reverse (3127313), we get a palindrome (34499443).

The spelling of 31372130 in words is "thirty-one million, three hundred seventy-two thousand, one hundred thirty".