257455843 has 2 divisors, whose sum is σ = 257455844. Its totient is φ = 257455842.

The previous prime is 257455841. The next prime is 257455873. The reversal of 257455843 is 348554752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257455843 - 2¹ = 257455841 is a prime.

It is a super-2 number, since 2×257455843² = 132567022189681298, which contains 22 as substring.

Together with 257455841, 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 257455843.

It is not a weakly prime, because it can be changed into another prime (257455841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128727921 + 128727922.

It is an arithmetic number, because the mean of its divisors is an integer number (128727922).

Almost surely, 2^257455843 is an apocalyptic number.

257455843 is a deficient number, since it is larger than the sum of its proper divisors (1).

257455843 is an equidigital number, since it uses as much as digits as its factorization.

257455843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672000, while the sum is 43.

The square root of 257455843 is about 16045.4305956556. The cubic root of 257455843 is about 636.1617956242.

The spelling of 257455843 in words is "two hundred fifty-seven million, four hundred fifty-five thousand, eight hundred forty-three".