31125030 has 32 divisors (see below), whose sum is σ = 75255264. Its totient is φ = 8238336.

The previous prime is 31125007. The next prime is 31125047. The reversal of 31125030 is 3052113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324 + ... + 7896.

It is an arithmetic number, because the mean of its divisors is an integer number (2351727).

Almost surely, 2^31125030 is an apocalyptic number.

31125030 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31125030 is an abundant number, since it is smaller than the sum of its proper divisors (44130234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31125030 is a wasteful number, since it uses less digits than its factorization.

31125030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 31125030 is about 5578.9810897690. The cubic root of 31125030 is about 314.5598286411.

Adding to 31125030 its reverse (3052113), we get a palindrome (34177143).

The spelling of 31125030 in words is "thirty-one million, one hundred twenty-five thousand, thirty".