31215130 has 32 divisors (see below), whose sum is σ = 57646080. Its totient is φ = 12166080.

The previous prime is 31215127. The next prime is 31215131. The reversal of 31215130 is 3151213.

It is not an unprimeable number, because it can be changed into a prime (31215131) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 112552 + ... + 112828.

It is an arithmetic number, because the mean of its divisors is an integer number (1801440).

Almost surely, 2^31215130 is an apocalyptic number.

31215130 is a deficient number, since it is larger than the sum of its proper divisors (26430950).

31215130 is a wasteful number, since it uses less digits than its factorization.

31215130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31215130 is about 5587.0502056094. The cubic root of 31215130 is about 314.8630630123.

Adding to 31215130 its reverse (3151213), we get a palindrome (34366343).

The spelling of 31215130 in words is "thirty-one million, two hundred fifteen thousand, one hundred thirty".