313261321 has 4 divisors (see below), whose sum is σ = 320546512. Its totient is φ = 305976132.

The previous prime is 313261309. The next prime is 313261331. The reversal of 313261321 is 123162313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123162313 = 19 ⋅6482227.

It is not a de Polignac number, because 313261321 - 2¹¹ = 313259273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313261292 and 313261301.

It is not an unprimeable number, because it can be changed into a prime (313261331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3642531 + ... + 3642616.

It is an arithmetic number, because the mean of its divisors is an integer number (80136628).

Almost surely, 2^313261321 is an apocalyptic number.

It is an amenable number.

313261321 is a deficient number, since it is larger than the sum of its proper divisors (7285191).

313261321 is an equidigital number, since it uses as much as digits as its factorization.

313261321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7285190.

The product of its digits is 648, while the sum is 22.

The square root of 313261321 is about 17699.1898402159. The cubic root of 313261321 is about 679.1550354054.

The spelling of 313261321 in words is "three hundred thirteen million, two hundred sixty-one thousand, three hundred twenty-one".