257861543 has 4 divisors (see below), whose sum is σ = 258124848. Its totient is φ = 257598240.

The previous prime is 257861509. The next prime is 257861551. The reversal of 257861543 is 345168752.

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 257861543 - 2¹² = 257857447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257861543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257861573) 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, 130178 + ... + 132143.

It is an arithmetic number, because the mean of its divisors is an integer number (64531212).

Almost surely, 2^257861543 is an apocalyptic number.

257861543 is a deficient number, since it is larger than the sum of its proper divisors (263305).

257861543 is an equidigital number, since it uses as much as digits as its factorization.

257861543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263304.

The product of its digits is 201600, while the sum is 41.

The square root of 257861543 is about 16058.0678476584. The cubic root of 257861543 is about 636.4957757341.

The spelling of 257861543 in words is "two hundred fifty-seven million, eight hundred sixty-one thousand, five hundred forty-three".