345676561 has 2 divisors, whose sum is σ = 345676562. Its totient is φ = 345676560.

The previous prime is 345676553. The next prime is 345676571. The reversal of 345676561 is 165676543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340587025 + 5089536 = 18455^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 345676561 - 2³ = 345676553 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (345676501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172838280 + 172838281.

It is an arithmetic number, because the mean of its divisors is an integer number (172838281).

Almost surely, 2^345676561 is an apocalyptic number.

It is an amenable number.

345676561 is a deficient number, since it is larger than the sum of its proper divisors (1).

345676561 is an equidigital number, since it uses as much as digits as its factorization.

345676561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 43.

The square root of 345676561 is about 18592.3791108077. The cubic root of 345676561 is about 701.8160741139.

The spelling of 345676561 in words is "three hundred forty-five million, six hundred seventy-six thousand, five hundred sixty-one".