313521665621 has 8 divisors (see below), whose sum is σ = 313990601760. Its totient is φ = 313052851728.

The previous prime is 313521665591. The next prime is 313521665659. The reversal of 313521665621 is 126566125313.

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 313521665621 - 2⁶ = 313521665557 is a prime.

It is a super-2 number, since 2×313521665621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313521667621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5972330 + ... + 6024596.

It is an arithmetic number, because the mean of its divisors is an integer number (39248825220).

Almost surely, 2^313521665621 is an apocalyptic number.

It is an amenable number.

313521665621 is a deficient number, since it is larger than the sum of its proper divisors (468936139).

313521665621 is an equidigital number, since it uses as much as digits as its factorization.

313521665621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61123.

The product of its digits is 194400, while the sum is 41.

The spelling of 313521665621 in words is "three hundred thirteen billion, five hundred twenty-one million, six hundred sixty-five thousand, six hundred twenty-one".