31125630 has 32 divisors (see below), whose sum is σ = 75207168. Its totient is φ = 8244000.

The previous prime is 31125617. The next prime is 31125649. The reversal of 31125630 is 3652113.

It is a junction number, because it is equal to n+sod(n) for n = 31125597 and 31125606.

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, 1095 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (2350224).

Almost surely, 2^31125630 is an apocalyptic number.

31125630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31125630 is an abundant number, since it is smaller than the sum of its proper divisors (44081538).

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

31125630 is a wasteful number, since it uses less digits than its factorization.

31125630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 31125630 is about 5579.0348627697. The cubic root of 31125630 is about 314.5618498942.

Adding to 31125630 its reverse (3652113), we get a palindrome (34777743).

The spelling of 31125630 in words is "thirty-one million, one hundred twenty-five thousand, six hundred thirty".