313123421 has 4 divisors (see below), whose sum is σ = 337209852. Its totient is φ = 289036992.

The previous prime is 313123333. The next prime is 313123441. The reversal of 313123421 is 124321313.

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 87703225 + 225420196 = 9365^2 + 15014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313123421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313123393 and 313123402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313123441) 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, 12043196 + ... + 12043221.

It is an arithmetic number, because the mean of its divisors is an integer number (84302463).

Almost surely, 2^313123421 is an apocalyptic number.

It is an amenable number.

313123421 is a deficient number, since it is larger than the sum of its proper divisors (24086431).

313123421 is a wasteful number, since it uses less digits than its factorization.

313123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24086430.

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

The square root of 313123421 is about 17695.2937528598. The cubic root of 313123421 is about 679.0553643862.

Adding to 313123421 its reverse (124321313), we get a palindrome (437444734).

The spelling of 313123421 in words is "three hundred thirteen million, one hundred twenty-three thousand, four hundred twenty-one".