249877057 has 4 divisors (see below), whose sum is σ = 249909076. Its totient is φ = 249845040.

The previous prime is 249877039. The next prime is 249877063. The reversal of 249877057 is 750778942.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 144937521 + 104939536 = 12039^2 + 10244^2 .

It is a cyclic number.

It is not a de Polignac number, because 249877057 - 2¹¹ = 249875009 is a prime.

It is a super-2 number, since 2×249877057² = 124877087229962498, which contains 22 as substring.

It is the 15808-th Hogben number.

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 249877057.

It is not an unprimeable number, because it can be changed into a prime (249877157) by changing a digit.

It is a nontrivial repunit in base 15807.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4207 + ... + 22747.

It is an arithmetic number, because the mean of its divisors is an integer number (62477269).

Almost surely, 2^249877057 is an apocalyptic number.

It is an amenable number.

249877057 is a deficient number, since it is larger than the sum of its proper divisors (32019).

249877057 is a wasteful number, since it uses less digits than its factorization.

249877057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32018.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 249877057 is about 15807.5000237229. The cubic root of 249877057 is about 629.8572423660.

The spelling of 249877057 in words is "two hundred forty-nine million, eight hundred seventy-seven thousand, fifty-seven".