243426857 has 2 divisors, whose sum is σ = 243426858. Its totient is φ = 243426856.

The previous prime is 243426851. The next prime is 243426877. The reversal of 243426857 is 758624342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180526096 + 62900761 = 13436^2 + 7931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243426857 is a prime.

It is not a weakly prime, because it can be changed into another prime (243426851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121713428 + 121713429.

It is an arithmetic number, because the mean of its divisors is an integer number (121713429).

Almost surely, 2^243426857 is an apocalyptic number.

It is an amenable number.

243426857 is a deficient number, since it is larger than the sum of its proper divisors (1).

243426857 is an equidigital number, since it uses as much as digits as its factorization.

243426857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 41.

The square root of 243426857 is about 15602.1427054107. The cubic root of 243426857 is about 624.3903234379.

The spelling of 243426857 in words is "two hundred forty-three million, four hundred twenty-six thousand, eight hundred fifty-seven".