31405723542 has 40 divisors (see below), whose sum is σ = 74075885400. Its totient is φ = 9917595936.

The previous prime is 31405723477. The next prime is 31405723577. The reversal of 31405723542 is 24532750413.

31405723542 is a `hidden beast` number, since 3 + 1 + 40 + 5 + 72 + 3 + 542 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31405723497 and 31405723506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5098567 + ... + 5104722.

It is an arithmetic number, because the mean of its divisors is an integer number (1851897135).

Almost surely, 2^31405723542 is an apocalyptic number.

31405723542 is an abundant number, since it is smaller than the sum of its proper divisors (42670161858).

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

31405723542 is a wasteful number, since it uses less digits than its factorization.

31405723542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203322 (or 10203313 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The spelling of 31405723542 in words is "thirty-one billion, four hundred five million, seven hundred twenty-three thousand, five hundred forty-two".