257242543 has 4 divisors (see below), whose sum is σ = 258946288. Its totient is φ = 255538800.

The previous prime is 257242519. The next prime is 257242553. The reversal of 257242543 is 345242752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257242543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257242499 and 257242508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257242553) 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, 851646 + ... + 851947.

It is an arithmetic number, because the mean of its divisors is an integer number (64736572).

Almost surely, 2^257242543 is an apocalyptic number.

257242543 is a deficient number, since it is larger than the sum of its proper divisors (1703745).

257242543 is a wasteful number, since it uses less digits than its factorization.

257242543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703744.

The product of its digits is 67200, while the sum is 34.

The square root of 257242543 is about 16038.7824662597. The cubic root of 257242543 is about 635.9860621855.

The spelling of 257242543 in words is "two hundred fifty-seven million, two hundred forty-two thousand, five hundred forty-three".