351006661 has 2 divisors, whose sum is σ = 351006662. Its totient is φ = 351006660.

The previous prime is 351006659. The next prime is 351006671. The reversal of 351006661 is 166600153.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 337456900 + 13549761 = 18370^2 + 3681^2 .

It is a cyclic number.

It is not a de Polignac number, because 351006661 - 2¹ = 351006659 is a prime.

Together with 351006659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351006641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175503330 + 175503331.

It is an arithmetic number, because the mean of its divisors is an integer number (175503331).

Almost surely, 2^351006661 is an apocalyptic number.

It is an amenable number.

351006661 is a deficient number, since it is larger than the sum of its proper divisors (1).

351006661 is an equidigital number, since it uses as much as digits as its factorization.

351006661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 351006661 is about 18735.1717632906. The cubic root of 351006661 is about 705.4048684647.

The spelling of 351006661 in words is "three hundred fifty-one million, six thousand, six hundred sixty-one".