31988380505 has 16 divisors (see below), whose sum is σ = 38977956864. Its totient is φ = 25196476800.

The previous prime is 31988380483. The next prime is 31988380507. The reversal of 31988380505 is 50508388913.

It is a de Polignac number, because none of the positive numbers 2^k-31988380505 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31988380507) 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, 699080 + ... + 743430.

It is an arithmetic number, because the mean of its divisors is an integer number (2436122304).

Almost surely, 2^31988380505 is an apocalyptic number.

It is an amenable number.

31988380505 is a deficient number, since it is larger than the sum of its proper divisors (6989576359).

31988380505 is a wasteful number, since it uses less digits than its factorization.

31988380505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46576.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 31988380505 in words is "thirty-one billion, nine hundred eighty-eight million, three hundred eighty thousand, five hundred five".