345518561 has 2 divisors, whose sum is σ = 345518562. Its totient is φ = 345518560.

The previous prime is 345518549. The next prime is 345518597. The reversal of 345518561 is 165815543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342435025 + 3083536 = 18505^2 + 1756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345518561 is a prime.

It is not a weakly prime, because it can be changed into another prime (345518161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172759280 + 172759281.

It is an arithmetic number, because the mean of its divisors is an integer number (172759281).

Almost surely, 2^345518561 is an apocalyptic number.

It is an amenable number.

345518561 is a deficient number, since it is larger than the sum of its proper divisors (1).

345518561 is an equidigital number, since it uses as much as digits as its factorization.

345518561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 38.

The square root of 345518561 is about 18588.1295723911. The cubic root of 345518561 is about 701.7091303684.

The spelling of 345518561 in words is "three hundred forty-five million, five hundred eighteen thousand, five hundred sixty-one".