10311721505 has 8 divisors (see below), whose sum is σ = 12396284712. Its totient is φ = 8234564608.

The previous prime is 10311721481. The next prime is 10311721513. The reversal of 10311721505 is 50512711301.

It can be written as a sum of positive squares in 4 ways, for example, as 31181056 + 10280540449 = 5584^2 + 101393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10311721505 - 2²⁸ = 10043286049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1848512 + ... + 1854081.

It is an arithmetic number, because the mean of its divisors is an integer number (1549535589).

Almost surely, 2^10311721505 is an apocalyptic number.

It is an amenable number.

10311721505 is a deficient number, since it is larger than the sum of its proper divisors (2084563207).

10311721505 is an equidigital number, since it uses as much as digits as its factorization.

10311721505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703155.

The product of its (nonzero) digits is 1050, while the sum is 26.

The spelling of 10311721505 in words is "ten billion, three hundred eleven million, seven hundred twenty-one thousand, five hundred five".