257245061 has 2 divisors, whose sum is σ = 257245062. Its totient is φ = 257245060.

The previous prime is 257245057. The next prime is 257245069. The reversal of 257245061 is 160542752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240064036 + 17181025 = 15494^2 + 4145^2 .

It is a cyclic number.

It is not a de Polignac number, because 257245061 - 2² = 257245057 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257245069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128622530 + 128622531.

It is an arithmetic number, because the mean of its divisors is an integer number (128622531).

Almost surely, 2^257245061 is an apocalyptic number.

It is an amenable number.

257245061 is a deficient number, since it is larger than the sum of its proper divisors (1).

257245061 is an equidigital number, since it uses as much as digits as its factorization.

257245061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 257245061 is about 16038.8609632979. The cubic root of 257245061 is about 635.9881372799.

The spelling of 257245061 in words is "two hundred fifty-seven million, two hundred forty-five thousand, sixty-one".