313345621 has 2 divisors, whose sum is σ = 313345622. Its totient is φ = 313345620.

The previous prime is 313345589. The next prime is 313345693. The reversal of 313345621 is 126543313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230280625 + 83064996 = 15175^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 313345621 - 2⁵ = 313345589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 313345621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313342621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156672810 + 156672811.

It is an arithmetic number, because the mean of its divisors is an integer number (156672811).

Almost surely, 2^313345621 is an apocalyptic number.

It is an amenable number.

313345621 is a deficient number, since it is larger than the sum of its proper divisors (1).

313345621 is an equidigital number, since it uses as much as digits as its factorization.

313345621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 28.

The square root of 313345621 is about 17701.5711449577. The cubic root of 313345621 is about 679.2159511444.

Adding to 313345621 its reverse (126543313), we get a palindrome (439888934).

The spelling of 313345621 in words is "three hundred thirteen million, three hundred forty-five thousand, six hundred twenty-one".