31121303130 has 72 divisors (see below), whose sum is σ = 85955172732. Its totient is φ = 7810830336.

The previous prime is 31121303119. The next prime is 31121303149. The reversal of 31121303130 is 3130312113.

It is a happy number.

31121303130 is a `hidden beast` number, since 311 + 21 + 303 + 1 + 30 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 28879943481 + 2241359649 = 169941^2 + 47343^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 572247 + ... + 624266.

Almost surely, 2^31121303130 is an apocalyptic number.

31121303130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31121303130 is an abundant number, since it is smaller than the sum of its proper divisors (54833869602).

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

31121303130 is a wasteful number, since it uses less digits than its factorization.

31121303130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196560 (or 1196540 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31121303130 its reverse (3130312113), we get a palindrome (34251615243).

The spelling of 31121303130 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, one hundred thirty".