313221431 has 4 divisors (see below), whose sum is σ = 324022200. Its totient is φ = 302420664.

The previous prime is 313221409. The next prime is 313221443. The reversal of 313221431 is 134122313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134122313 = 13 ⋅10317101.

It is a cyclic number.

It is not a de Polignac number, because 313221431 - 2¹⁸ = 312959287 is a prime.

It is a super-2 number, since 2×313221431² = 196215329675375522, which 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 (313221401) 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, 5400341 + ... + 5400398.

It is an arithmetic number, because the mean of its divisors is an integer number (81005550).

Almost surely, 2^313221431 is an apocalyptic number.

313221431 is a deficient number, since it is larger than the sum of its proper divisors (10800769).

313221431 is a wasteful number, since it uses less digits than its factorization.

313221431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800768.

The product of its digits is 432, while the sum is 20.

The square root of 313221431 is about 17698.0629166019. The cubic root of 313221431 is about 679.1262068177.

Adding to 313221431 its reverse (134122313), we get a palindrome (447343744).

The spelling of 313221431 in words is "three hundred thirteen million, two hundred twenty-one thousand, four hundred thirty-one".