257325247 has 4 divisors (see below), whose sum is σ = 257463360. Its totient is φ = 257187136.

The previous prime is 257325223. The next prime is 257325259. The reversal of 257325247 is 742523752.

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

It is a cyclic number.

It is not a de Polignac number, because 257325247 - 2¹⁵ = 257292479 is a prime.

It is a super-2 number, since 2×257325247² = 132432565487222018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257305247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66223 + ... + 70000.

It is an arithmetic number, because the mean of its divisors is an integer number (64365840).

Almost surely, 2^257325247 is an apocalyptic number.

257325247 is a deficient number, since it is larger than the sum of its proper divisors (138113).

257325247 is a wasteful number, since it uses less digits than its factorization.

257325247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138112.

The product of its digits is 117600, while the sum is 37.

The square root of 257325247 is about 16041.3605096326. The cubic root of 257325247 is about 636.0542118195.

Adding to 257325247 its reverse (742523752), we get a palindrome (999848999).

The spelling of 257325247 in words is "two hundred fifty-seven million, three hundred twenty-five thousand, two hundred forty-seven".