257890291 has 2 divisors, whose sum is σ = 257890292. Its totient is φ = 257890290.

The previous prime is 257890277. The next prime is 257890313. The reversal of 257890291 is 192098752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257890291 - 2¹³ = 257882099 is a prime.

It is not a weakly prime, because it can be changed into another prime (257890231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128945145 + 128945146.

It is an arithmetic number, because the mean of its divisors is an integer number (128945146).

Almost surely, 2^257890291 is an apocalyptic number.

257890291 is a deficient number, since it is larger than the sum of its proper divisors (1).

257890291 is an equidigital number, since it uses as much as digits as its factorization.

257890291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 257890291 is about 16058.9629490824. The cubic root of 257890291 is about 636.5194283506.

The spelling of 257890291 in words is "two hundred fifty-seven million, eight hundred ninety thousand, two hundred ninety-one".