31611601220 has 96 divisors (see below), whose sum is σ = 69018034176. Its totient is φ = 12154083200.

The previous prime is 31611601213. The next prime is 31611601243. The reversal of 31611601220 is 2210611613.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20755379 + ... + 20756901.

It is an arithmetic number, because the mean of its divisors is an integer number (718937856).

Almost surely, 2^31611601220 is an apocalyptic number.

It is an amenable number.

31611601220 is an abundant number, since it is smaller than the sum of its proper divisors (37406432956).

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

31611601220 is a wasteful number, since it uses less digits than its factorization.

31611601220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 31611601220 in words is "thirty-one billion, six hundred eleven million, six hundred one thousand, two hundred twenty".