257143069 has 2 divisors, whose sum is σ = 257143070. Its totient is φ = 257143068.

The previous prime is 257143067. The next prime is 257143097. The reversal of 257143069 is 960341752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212051844 + 45091225 = 14562^2 + 6715^2 .

It is a cyclic number.

It is not a de Polignac number, because 257143069 - 2¹ = 257143067 is a prime.

It is a super-2 number, since 2×257143069² = 132245115869477522, which contains 22 as substring.

Together with 257143067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257143067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128571534 + 128571535.

It is an arithmetic number, because the mean of its divisors is an integer number (128571535).

Almost surely, 2^257143069 is an apocalyptic number.

It is an amenable number.

257143069 is a deficient number, since it is larger than the sum of its proper divisors (1).

257143069 is an equidigital number, since it uses as much as digits as its factorization.

257143069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 257143069 is about 16035.6811205511. The cubic root of 257143069 is about 635.9040744070.

The spelling of 257143069 in words is "two hundred fifty-seven million, one hundred forty-three thousand, sixty-nine".