31523545000 has 80 divisors (see below), whose sum is σ = 74622253860. Its totient is φ = 12479232000.

The previous prime is 31523544989. The next prime is 31523545003. The reversal of 31523545000 is 54532513.

It can be written as a sum of positive squares in 10 ways, for example, as 7956996804 + 23566548196 = 89202^2 + 153514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31523545000.

It is not an unprimeable number, because it can be changed into a prime (31523545003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 452502 + ... + 517498.

Almost surely, 2^31523545000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31523545000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37311126930).

31523545000 is an abundant number, since it is smaller than the sum of its proper divisors (43098708860).

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

31523545000 is an equidigital number, since it uses as much as digits as its factorization.

31523545000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65120 (or 65101 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The spelling of 31523545000 in words is "thirty-one billion, five hundred twenty-three million, five hundred forty-five thousand".