257220079 has 2 divisors, whose sum is σ = 257220080. Its totient is φ = 257220078.

The previous prime is 257220059. The next prime is 257220091. The reversal of 257220079 is 970022752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257220079 - 2⁷ = 257219951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257220059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128610039 + 128610040.

It is an arithmetic number, because the mean of its divisors is an integer number (128610040).

Almost surely, 2^257220079 is an apocalyptic number.

257220079 is a deficient number, since it is larger than the sum of its proper divisors (1).

257220079 is an equidigital number, since it uses as much as digits as its factorization.

257220079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 257220079 is about 16038.0821484366. The cubic root of 257220079 is about 635.9675489092.

The spelling of 257220079 in words is "two hundred fifty-seven million, two hundred twenty thousand, seventy-nine".