257223761 has 2 divisors, whose sum is σ = 257223762. Its totient is φ = 257223760.

The previous prime is 257223751. The next prime is 257223779. The reversal of 257223761 is 167322752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 5017600 = 15881^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 257223761 - 2²² = 253029457 is a prime.

It is not a weakly prime, because it can be changed into another prime (257223751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128611880 + 128611881.

It is an arithmetic number, because the mean of its divisors is an integer number (128611881).

Almost surely, 2^257223761 is an apocalyptic number.

It is an amenable number.

257223761 is a deficient number, since it is larger than the sum of its proper divisors (1).

257223761 is an equidigital number, since it uses as much as digits as its factorization.

257223761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 35.

The square root of 257223761 is about 16038.1969373119. The cubic root of 257223761 is about 635.9705834330.

The spelling of 257223761 in words is "two hundred fifty-seven million, two hundred twenty-three thousand, seven hundred sixty-one".