345106621 has 2 divisors, whose sum is σ = 345106622. Its totient is φ = 345106620.

The previous prime is 345106609. The next prime is 345106627. The reversal of 345106621 is 126601543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177688900 + 167417721 = 13330^2 + 12939^2 .

It is an emirp because it is prime and its reverse (126601543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345106621 - 2⁵ = 345106589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 345106621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345106627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172553310 + 172553311.

It is an arithmetic number, because the mean of its divisors is an integer number (172553311).

Almost surely, 2^345106621 is an apocalyptic number.

It is an amenable number.

345106621 is a deficient number, since it is larger than the sum of its proper divisors (1).

345106621 is an equidigital number, since it uses as much as digits as its factorization.

345106621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 345106621 is about 18577.0455401283. The cubic root of 345106621 is about 701.4301516151.

The spelling of 345106621 in words is "three hundred forty-five million, one hundred six thousand, six hundred twenty-one".