257126081 has 4 divisors (see below), whose sum is σ = 258054612. Its totient is φ = 256197552.

The previous prime is 257126063. The next prime is 257126083. The reversal of 257126081 is 180621752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168766081 + 88360000 = 12991^2 + 9400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257126081 is a prime.

It is a super-2 number, since 2×257126081² = 132227643060837122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257126083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463850 + ... + 464403.

It is an arithmetic number, because the mean of its divisors is an integer number (64513653).

Almost surely, 2^257126081 is an apocalyptic number.

It is an amenable number.

257126081 is a deficient number, since it is larger than the sum of its proper divisors (928531).

257126081 is an equidigital number, since it uses as much as digits as its factorization.

257126081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928530.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 257126081 is about 16035.1514180565. The cubic root of 257126081 is about 635.8900705603.

The spelling of 257126081 in words is "two hundred fifty-seven million, one hundred twenty-six thousand, eighty-one".