257163247 has 8 divisors (see below), whose sum is σ = 280679040. Its totient is φ = 233670360.

The previous prime is 257163239. The next prime is 257163287. The reversal of 257163247 is 742361752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257163247 - 2³ = 257163239 is a prime.

It is a super-2 number, since 2×257163247² = 132265871215166018, 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 (257163217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24904 + ... + 33682.

It is an arithmetic number, because the mean of its divisors is an integer number (35084880).

Almost surely, 2^257163247 is an apocalyptic number.

257163247 is a deficient number, since it is larger than the sum of its proper divisors (23515793).

257163247 is a wasteful number, since it uses less digits than its factorization.

257163247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11453.

The product of its digits is 70560, while the sum is 37.

The square root of 257163247 is about 16036.3102676395. The cubic root of 257163247 is about 635.9207070892.

The spelling of 257163247 in words is "two hundred fifty-seven million, one hundred sixty-three thousand, two hundred forty-seven".