257319943 has 2 divisors, whose sum is σ = 257319944. Its totient is φ = 257319942.

The previous prime is 257319919. The next prime is 257319947. The reversal of 257319943 is 349913752.

257319943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257319943 - 2⁹ = 257319431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257319943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257319947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128659971 + 128659972.

It is an arithmetic number, because the mean of its divisors is an integer number (128659972).

Almost surely, 2^257319943 is an apocalyptic number.

257319943 is a deficient number, since it is larger than the sum of its proper divisors (1).

257319943 is an equidigital number, since it uses as much as digits as its factorization.

257319943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 257319943 is about 16041.1951861450. The cubic root of 257319943 is about 636.0498416631.

The spelling of 257319943 in words is "two hundred fifty-seven million, three hundred nineteen thousand, nine hundred forty-three".