31231230820 has 24 divisors (see below), whose sum is σ = 65594217528. Its totient is φ = 12490848000.

The previous prime is 31231230773. The next prime is 31231230827. The reversal of 31231230820 is 2803213213.

It can be written as a sum of positive squares in 4 ways, for example, as 3348242496 + 27882988324 = 57864^2 + 166982^2 .

It is not an unprimeable number, because it can be changed into a prime (31231230827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59200 + ... + 256840.

It is an arithmetic number, because the mean of its divisors is an integer number (2733092397).

Almost surely, 2^31231230820 is an apocalyptic number.

It is an amenable number.

31231230820 is an abundant number, since it is smaller than the sum of its proper divisors (34362986708).

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

31231230820 is a wasteful number, since it uses less digits than its factorization.

31231230820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205551 (or 205549 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 31231230820 in words is "thirty-one billion, two hundred thirty-one million, two hundred thirty thousand, eight hundred twenty".