345701621 has 2 divisors, whose sum is σ = 345701622. Its totient is φ = 345701620.

The previous prime is 345701593. The next prime is 345701623. The reversal of 345701621 is 126107543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204804721 + 140896900 = 14311^2 + 11870^2 .

It is a cyclic number.

It is not a de Polignac number, because 345701621 - 2¹⁸ = 345439477 is a prime.

It is a super-2 number, since 2×345701621² = 239019221524055282, which contains 22 as substring.

Together with 345701623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345701623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172850810 + 172850811.

It is an arithmetic number, because the mean of its divisors is an integer number (172850811).

Almost surely, 2^345701621 is an apocalyptic number.

It is an amenable number.

345701621 is a deficient number, since it is larger than the sum of its proper divisors (1).

345701621 is an equidigital number, since it uses as much as digits as its factorization.

345701621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 345701621 is about 18593.0530306349. The cubic root of 345701621 is about 701.8330332098.

The spelling of 345701621 in words is "three hundred forty-five million, seven hundred one thousand, six hundred twenty-one".