31431123420440 has 32 divisors (see below), whose sum is σ = 70922663910000. Its totient is φ = 12536425152384.

The previous prime is 31431123420421. The next prime is 31431123420451. The reversal of 31431123420440 is 4402432113413.

It is a junction number, because it is equal to n+sod(n) for n = 31431123420397 and 31431123420406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1125742610 + ... + 1125770529.

Almost surely, 2^{31431123420440} is an apocalyptic number.

It is an amenable number.

31431123420440 is an abundant number, since it is smaller than the sum of its proper divisors (39491540489560).

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

31431123420440 is a wasteful number, since it uses less digits than its factorization.

31431123420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251513499 (or 2251513495 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 31431123420440 its reverse (4402432113413), we get a palindrome (35833555533853).

The spelling of 31431123420440 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred twenty-three million, four hundred twenty thousand, four hundred forty".