257434487 has 2 divisors, whose sum is σ = 257434488. Its totient is φ = 257434486.

The previous prime is 257434481. The next prime is 257434501. The reversal of 257434487 is 784434752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257434487 - 2⁸ = 257434231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257434481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128717243 + 128717244.

It is an arithmetic number, because the mean of its divisors is an integer number (128717244).

Almost surely, 2^257434487 is an apocalyptic number.

257434487 is a deficient number, since it is larger than the sum of its proper divisors (1).

257434487 is an equidigital number, since it uses as much as digits as its factorization.

257434487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 44.

The square root of 257434487 is about 16044.7650964419. The cubic root of 257434487 is about 636.1442052331.

The spelling of 257434487 in words is "two hundred fifty-seven million, four hundred thirty-four thousand, four hundred eighty-seven".