31123521152 has 64 divisors (see below), whose sum is σ = 63791287560. Its totient is φ = 15116451840.

The previous prime is 31123521127. The next prime is 31123521167. The reversal of 31123521152 is 25112532113.

It can be written as a sum of positive squares in 4 ways, for example, as 13861765696 + 17261755456 = 117736^2 + 131384^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1210058 + ... + 1235510.

Almost surely, 2^31123521152 is an apocalyptic number.

31123521152 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 31123521152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31895643780).

31123521152 is an abundant number, since it is smaller than the sum of its proper divisors (32667766408).

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

31123521152 is a wasteful number, since it uses less digits than its factorization.

31123521152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25741 (or 25729 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The spelling of 31123521152 in words is "thirty-one billion, one hundred twenty-three million, five hundred twenty-one thousand, one hundred fifty-two".