31409693748 has 36 divisors (see below), whose sum is σ = 84067123140. Its totient is φ = 9854021376.

The previous prime is 31409693719. The next prime is 31409693789. The reversal of 31409693748 is 84739690413.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26102279844 + 5307413904 = 161562^2 + 72852^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×31409693748² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31409693694 and 31409693703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25660903 + ... + 25662126.

It is an arithmetic number, because the mean of its divisors is an integer number (2335197865).

Almost surely, 2^31409693748 is an apocalyptic number.

It is an amenable number.

31409693748 is an abundant number, since it is smaller than the sum of its proper divisors (52657429392).

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

31409693748 is a wasteful number, since it uses less digits than its factorization.

31409693748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51323056 (or 51323051 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 31409693748 in words is "thirty-one billion, four hundred nine million, six hundred ninety-three thousand, seven hundred forty-eight".