249045457 has 4 divisors (see below), whose sum is σ = 249152436. Its totient is φ = 248938480.

The previous prime is 249045361. The next prime is 249045479. The reversal of 249045457 is 754540942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754540942 = 2 ⋅377270471.

It can be written as a sum of positive squares in 2 ways, for example, as 23775376 + 225270081 = 4876^2 + 15009^2 .

It is a cyclic number.

It is not a de Polignac number, because 249045457 - 2²⁷ = 114827729 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249045487) by changing a digit.

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, 49918 + ... + 54679.

It is an arithmetic number, because the mean of its divisors is an integer number (62288109).

Almost surely, 2^249045457 is an apocalyptic number.

It is an amenable number.

249045457 is a deficient number, since it is larger than the sum of its proper divisors (106979).

249045457 is a wasteful number, since it uses less digits than its factorization.

249045457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106978.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 249045457 is about 15781.1741324909. The cubic root of 249045457 is about 629.1577364715.

The spelling of 249045457 in words is "two hundred forty-nine million, forty-five thousand, four hundred fifty-seven".