31423994505 has 36 divisors (see below), whose sum is σ = 57860767692. Its totient is φ = 15773606400.

The previous prime is 31423994501. The next prime is 31423994507. The reversal of 31423994505 is 50549932413.

31423994505 is a `hidden beast` number, since 31 + 4 + 23 + 9 + 94 + 505 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 8125940736 + 23298053769 = 90144^2 + 152637^2 .

It is not a de Polignac number, because 31423994505 - 2² = 31423994501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (31423994501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1195146 + ... + 1221155.

It is an arithmetic number, because the mean of its divisors is an integer number (1607243547).

Almost surely, 2^31423994505 is an apocalyptic number.

It is an amenable number.

31423994505 is a deficient number, since it is larger than the sum of its proper divisors (26436773187).

31423994505 is a wasteful number, since it uses less digits than its factorization.

31423994505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416346 (or 2416326 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 31423994505 in words is "thirty-one billion, four hundred twenty-three million, nine hundred ninety-four thousand, five hundred five".