31121130 has 32 divisors (see below), whose sum is σ = 75437568. Its totient is φ = 8216000.

The previous prime is 31121087. The next prime is 31121137. The reversal of 31121130 is 3112113.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31121137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2106 + ... + 8165.

It is an arithmetic number, because the mean of its divisors is an integer number (2357424).

Almost surely, 2^31121130 is an apocalyptic number.

31121130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31121130 is an abundant number, since it is smaller than the sum of its proper divisors (44316438).

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

31121130 is a wasteful number, since it uses less digits than its factorization.

31121130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10382.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31121130 is about 5578.6315526301. The cubic root of 31121130 is about 314.5466898632.

Adding to 31121130 its reverse (3112113), we get a palindrome (34233243).

The spelling of 31121130 in words is "thirty-one million, one hundred twenty-one thousand, one hundred thirty".