31657002112 has 64 divisors (see below), whose sum is σ = 63944697600. Its totient is φ = 15608853504.

The previous prime is 31657002107. The next prime is 31657002121. The reversal of 31657002112 is 21120075613.

It is a happy number.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6446314 + ... + 6451222.

It is an arithmetic number, because the mean of its divisors is an integer number (999135900).

Almost surely, 2^31657002112 is an apocalyptic number.

31657002112 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 31657002112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31972348800).

31657002112 is an abundant number, since it is smaller than the sum of its proper divisors (32287695488).

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

31657002112 is an equidigital number, since it uses as much as digits as its factorization.

31657002112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613 (or 5601 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 31657002112 its reverse (21120075613), we get a palindrome (52777077725).

The spelling of 31657002112 in words is "thirty-one billion, six hundred fifty-seven million, two thousand, one hundred twelve".