31349388128 has 24 divisors (see below), whose sum is σ = 62075876688. Its totient is φ = 15584086144.

The previous prime is 31349388121. The next prime is 31349388139. The reversal of 31349388128 is 82188394313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31349388121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825876 + ... + 2836947.

It is an arithmetic number, because the mean of its divisors is an integer number (2586494862).

Almost surely, 2^31349388128 is an apocalyptic number.

It is an amenable number.

31349388128 is a deficient number, since it is larger than the sum of its proper divisors (30726488560).

31349388128 is a wasteful number, since it uses less digits than its factorization.

31349388128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663006 (or 5662998 counting only the distinct ones).

The product of its digits is 995328, while the sum is 50.

The spelling of 31349388128 in words is "thirty-one billion, three hundred forty-nine million, three hundred eighty-eight thousand, one hundred twenty-eight".