31513450505 has 4 divisors (see below), whose sum is σ = 37816140612. Its totient is φ = 25210760400.

The previous prime is 31513450459. The next prime is 31513450517. The reversal of 31513450505 is 50505431513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17619642121 + 13893808384 = 132739^2 + 117872^2 .

It is not a de Polignac number, because 31513450505 - 2¹² = 31513446409 is a prime.

It is a Duffinian number.

It is a Curzon 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, 3151345046 + ... + 3151345055.

It is an arithmetic number, because the mean of its divisors is an integer number (9454035153).

Almost surely, 2^31513450505 is an apocalyptic number.

It is an amenable number.

31513450505 is a deficient number, since it is larger than the sum of its proper divisors (6302690107).

31513450505 is an equidigital number, since it uses as much as digits as its factorization.

31513450505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302690106.

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 31513450505 in words is "thirty-one billion, five hundred thirteen million, four hundred fifty thousand, five hundred five".