31225565220 has 48 divisors (see below), whose sum is σ = 87813418560. Its totient is φ = 8290452096.

The previous prime is 31225565197. The next prime is 31225565221. The reversal of 31225565220 is 2256552213.

It is not an unprimeable number, because it can be changed into a prime (31225565221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1122562 + ... + 1150041.

It is an arithmetic number, because the mean of its divisors is an integer number (1829446220).

Almost surely, 2^31225565220 is an apocalyptic number.

31225565220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31225565220 is an abundant number, since it is smaller than the sum of its proper divisors (56587853340).

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

31225565220 is a wasteful number, since it uses less digits than its factorization.

31225565220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272844 (or 2272842 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 31225565220 in words is "thirty-one billion, two hundred twenty-five million, five hundred sixty-five thousand, two hundred twenty".