257241847 has 2 divisors, whose sum is σ = 257241848. Its totient is φ = 257241846.

The previous prime is 257241827. The next prime is 257241851. The reversal of 257241847 is 748142752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257241847 - 2¹⁵ = 257209079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257241827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128620923 + 128620924.

It is an arithmetic number, because the mean of its divisors is an integer number (128620924).

Almost surely, 2^257241847 is an apocalyptic number.

257241847 is a deficient number, since it is larger than the sum of its proper divisors (1).

257241847 is an equidigital number, since it uses as much as digits as its factorization.

257241847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 257241847 is about 16038.7607688375. The cubic root of 257241847 is about 635.9854886066.

The spelling of 257241847 in words is "two hundred fifty-seven million, two hundred forty-one thousand, eight hundred forty-seven".