345243257 has 2 divisors, whose sum is σ = 345243258. Its totient is φ = 345243256.

The previous prime is 345243253. The next prime is 345243299. The reversal of 345243257 is 752342543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176996416 + 168246841 = 13304^2 + 12971^2 .

It is a cyclic number.

It is not a de Polignac number, because 345243257 - 2² = 345243253 is a prime.

It is not a weakly prime, because it can be changed into another prime (345243253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172621628 + 172621629.

It is an arithmetic number, because the mean of its divisors is an integer number (172621629).

Almost surely, 2^345243257 is an apocalyptic number.

It is an amenable number.

345243257 is a deficient number, since it is larger than the sum of its proper divisors (1).

345243257 is an equidigital number, since it uses as much as digits as its factorization.

345243257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 35.

The square root of 345243257 is about 18580.7227254485. The cubic root of 345243257 is about 701.5227104154.

The spelling of 345243257 in words is "three hundred forty-five million, two hundred forty-three thousand, two hundred fifty-seven".