257178223 has 2 divisors, whose sum is σ = 257178224. Its totient is φ = 257178222.

The previous prime is 257178211. The next prime is 257178269. The reversal of 257178223 is 322871752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257178223 is a prime.

It is a super-2 number, since 2×257178223² = 132281276770875458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257178323) 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, 128589111 + 128589112.

It is an arithmetic number, because the mean of its divisors is an integer number (128589112).

Almost surely, 2^257178223 is an apocalyptic number.

257178223 is a deficient number, since it is larger than the sum of its proper divisors (1).

257178223 is an equidigital number, since it uses as much as digits as its factorization.

257178223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 37.

The square root of 257178223 is about 16036.7772011711. Note that the first 3 decimals coincide. The cubic root of 257178223 is about 635.9330512114.

The spelling of 257178223 in words is "two hundred fifty-seven million, one hundred seventy-eight thousand, two hundred twenty-three".