345313621 has 2 divisors, whose sum is σ = 345313622. Its totient is φ = 345313620.

The previous prime is 345313613. The next prime is 345313667. The reversal of 345313621 is 126313543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 327791025 + 17522596 = 18105^2 + 4186^2 .

It is an emirp because it is prime and its reverse (126313543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345313621 - 2³ = 345313613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345313621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345313601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172656810 + 172656811.

It is an arithmetic number, because the mean of its divisors is an integer number (172656811).

Almost surely, 2^345313621 is an apocalyptic number.

It is an amenable number.

345313621 is a deficient number, since it is larger than the sum of its proper divisors (1).

345313621 is an equidigital number, since it uses as much as digits as its factorization.

345313621 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 345313621 is about 18582.6160967717. The cubic root of 345313621 is about 701.5703662734.

The spelling of 345313621 in words is "three hundred forty-five million, three hundred thirteen thousand, six hundred twenty-one".