31529091072 has 240 divisors, whose sum is σ = 90169541280. Its totient is φ = 9764339712.

The previous prime is 31529091053. The next prime is 31529091091. The reversal of 31529091072 is 27019092513.

It is an interprime number because it is at equal distance from previous prime (31529091053) and next prime (31529091091).

It is a self number, because there is not a number n which added to its sum of digits gives 31529091072.

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, 81051454 + ... + 81051842.

It is an arithmetic number, because the mean of its divisors is an integer number (375706422).

Almost surely, 2^31529091072 is an apocalyptic number.

31529091072 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31529091072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45084770640).

31529091072 is an abundant number, since it is smaller than the sum of its proper divisors (58640450208).

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

31529091072 is an equidigital number, since it uses as much as digits as its factorization.

31529091072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The spelling of 31529091072 in words is "thirty-one billion, five hundred twenty-nine million, ninety-one thousand, seventy-two".