257550533 has 2 divisors, whose sum is σ = 257550534. Its totient is φ = 257550532.

The previous prime is 257550499. The next prime is 257550551. The reversal of 257550533 is 335055752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242674084 + 14876449 = 15578^2 + 3857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257550533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257550493 and 257550502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257550593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128775266 + 128775267.

It is an arithmetic number, because the mean of its divisors is an integer number (128775267).

Almost surely, 2^257550533 is an apocalyptic number.

It is an amenable number.

257550533 is a deficient number, since it is larger than the sum of its proper divisors (1).

257550533 is an equidigital number, since it uses as much as digits as its factorization.

257550533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78750, while the sum is 35.

The square root of 257550533 is about 16048.3810086874. The cubic root of 257550533 is about 636.2397776401.

The spelling of 257550533 in words is "two hundred fifty-seven million, five hundred fifty thousand, five hundred thirty-three".