257089289 has 4 divisors (see below), whose sum is σ = 257165124. Its totient is φ = 257013456.

The previous prime is 257089279. The next prime is 257089307. The reversal of 257089289 is 982980752.

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 137077264 + 120012025 = 11708^2 + 10955^2 .

It is a cyclic number.

It is not a de Polignac number, because 257089289 - 2¹² = 257085193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257089279) 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, 32582 + ... + 39695.

It is an arithmetic number, because the mean of its divisors is an integer number (64291281).

Almost surely, 2^257089289 is an apocalyptic number.

It is an amenable number.

257089289 is a deficient number, since it is larger than the sum of its proper divisors (75835).

257089289 is an equidigital number, since it uses as much as digits as its factorization.

257089289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75834.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 257089289 is about 16034.0041474362. The cubic root of 257089289 is about 635.8597394178.

The spelling of 257089289 in words is "two hundred fifty-seven million, eighty-nine thousand, two hundred eighty-nine".