345212561 has 2 divisors, whose sum is σ = 345212562. Its totient is φ = 345212560.

The previous prime is 345212533. The next prime is 345212617. The reversal of 345212561 is 165212543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306075025 + 39137536 = 17495^2 + 6256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345212561 is a prime.

It is a Chen 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 (345212261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172606280 + 172606281.

It is an arithmetic number, because the mean of its divisors is an integer number (172606281).

Almost surely, 2^345212561 is an apocalyptic number.

It is an amenable number.

345212561 is a deficient number, since it is larger than the sum of its proper divisors (1).

345212561 is an equidigital number, since it uses as much as digits as its factorization.

345212561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 345212561 is about 18579.8966897020. The cubic root of 345212561 is about 701.5019187186.

The spelling of 345212561 in words is "three hundred forty-five million, two hundred twelve thousand, five hundred sixty-one".