31115120551220 has 48 divisors (see below), whose sum is σ = 65410337280960. Its totient is φ = 12432986260224.

The previous prime is 31115120551213. The next prime is 31115120551241. The reversal of 31115120551220 is 2215502151113.

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, 359806427 + ... + 359892893.

It is an arithmetic number, because the mean of its divisors is an integer number (1362715360020).

Almost surely, 2^{31115120551220} is an apocalyptic number.

It is an amenable number.

31115120551220 is an abundant number, since it is smaller than the sum of its proper divisors (34295216729740).

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

31115120551220 is a wasteful number, since it uses less digits than its factorization.

31115120551220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105152 (or 105150 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 31115120551220 in words is "thirty-one trillion, one hundred fifteen billion, one hundred twenty million, five hundred fifty-one thousand, two hundred twenty".