31121100180 has 96 divisors (see below), whose sum is σ = 97356430080. Its totient is φ = 8253083520.

The previous prime is 31121100163. The next prime is 31121100181. The reversal of 31121100180 is 8100112113.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121100181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61464 + ... + 256943.

It is an arithmetic number, because the mean of its divisors is an integer number (1014129480).

Almost surely, 2^31121100180 is an apocalyptic number.

31121100180 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31121100180 is an abundant number, since it is smaller than the sum of its proper divisors (66235329900).

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

31121100180 is a wasteful number, since it uses less digits than its factorization.

31121100180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318606 (or 318598 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 31121100180 its reverse (8100112113), we get a palindrome (39221212293).

The spelling of 31121100180 in words is "thirty-one billion, one hundred twenty-one million, one hundred thousand, one hundred eighty".