257542349 has 2 divisors, whose sum is σ = 257542350. Its totient is φ = 257542348.

The previous prime is 257542303. The next prime is 257542379. The reversal of 257542349 is 943245752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170119849 + 87422500 = 13043^2 + 9350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257542349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257542379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128771174 + 128771175.

It is an arithmetic number, because the mean of its divisors is an integer number (128771175).

Almost surely, 2^257542349 is an apocalyptic number.

It is an amenable number.

257542349 is a deficient number, since it is larger than the sum of its proper divisors (1).

257542349 is an equidigital number, since it uses as much as digits as its factorization.

257542349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 257542349 is about 16048.1260276706. The cubic root of 257542349 is about 636.2330384559.

The spelling of 257542349 in words is "two hundred fifty-seven million, five hundred forty-two thousand, three hundred forty-nine".