257259643 has 2 divisors, whose sum is σ = 257259644. Its totient is φ = 257259642.

The previous prime is 257259641. The next prime is 257259649. The reversal of 257259643 is 346952752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257259643 - 2¹ = 257259641 is a prime.

Together with 257259641, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 257259643.

It is not a weakly prime, because it can be changed into another prime (257259641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128629821 + 128629822.

It is an arithmetic number, because the mean of its divisors is an integer number (128629822).

Almost surely, 2^257259643 is an apocalyptic number.

257259643 is a deficient number, since it is larger than the sum of its proper divisors (1).

257259643 is an equidigital number, since it uses as much as digits as its factorization.

257259643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The square root of 257259643 is about 16039.3155402592. The cubic root of 257259643 is about 636.0001541012. Note that the first 3 decimals are identical.

The spelling of 257259643 in words is "two hundred fifty-seven million, two hundred fifty-nine thousand, six hundred forty-three".