31320407505 has 16 divisors (see below), whose sum is σ = 51058175040. Its totient is φ = 16389043008.

The previous prime is 31320407501. The next prime is 31320407507. The reversal of 31320407505 is 50570402313.

It is not a de Polignac number, because 31320407505 - 2² = 31320407501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31320407501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19697575 + ... + 19699164.

It is an arithmetic number, because the mean of its divisors is an integer number (3191135940).

Almost surely, 2^31320407505 is an apocalyptic number.

It is an amenable number.

31320407505 is a deficient number, since it is larger than the sum of its proper divisors (19737767535).

31320407505 is a wasteful number, since it uses less digits than its factorization.

31320407505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39396800.

The product of its (nonzero) digits is 12600, while the sum is 30.

Adding to 31320407505 its reverse (50570402313), we get a palindrome (81890809818).

The spelling of 31320407505 in words is "thirty-one billion, three hundred twenty million, four hundred seven thousand, five hundred five".