257474221 has 2 divisors, whose sum is σ = 257474222. Its totient is φ = 257474220.

The previous prime is 257474179. The next prime is 257474291. The reversal of 257474221 is 122474752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254051721 + 3422500 = 15939^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 257474221 - 2¹⁹ = 256949933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257474291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128737110 + 128737111.

It is an arithmetic number, because the mean of its divisors is an integer number (128737111).

Almost surely, 2^257474221 is an apocalyptic number.

It is an amenable number.

257474221 is a deficient number, since it is larger than the sum of its proper divisors (1).

257474221 is an equidigital number, since it uses as much as digits as its factorization.

257474221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 34.

The square root of 257474221 is about 16046.0032718431. The cubic root of 257474221 is about 636.1769323342.

The spelling of 257474221 in words is "two hundred fifty-seven million, four hundred seventy-four thousand, two hundred twenty-one".