31431144432 has 20 divisors (see below), whose sum is σ = 81197123240. Its totient is φ = 10477048128.

The previous prime is 31431144427. The next prime is 31431144469. The reversal of 31431144432 is 23444113413.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31431144432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327407707 + ... + 327407802.

It is an arithmetic number, because the mean of its divisors is an integer number (4059856162).

Almost surely, 2^31431144432 is an apocalyptic number.

It is an amenable number.

31431144432 is an abundant number, since it is smaller than the sum of its proper divisors (49765978808).

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

31431144432 is a wasteful number, since it uses less digits than its factorization.

31431144432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654815520 (or 654815514 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

Adding to 31431144432 its reverse (23444113413), we get a palindrome (54875257845).

The spelling of 31431144432 in words is "thirty-one billion, four hundred thirty-one million, one hundred forty-four thousand, four hundred thirty-two".