249536845 has 4 divisors (see below), whose sum is σ = 299444220. Its totient is φ = 199629472.

The previous prime is 249536827. The next prime is 249536873. The reversal of 249536845 is 548635942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548635942 = 2 ⋅274317971.

It can be written as a sum of positive squares in 2 ways, for example, as 31147561 + 218389284 = 5581^2 + 14778^2 .

It is a cyclic number.

It is not a de Polignac number, because 249536845 - 2⁷ = 249536717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249536795 and 249536804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24953680 + ... + 24953689.

It is an arithmetic number, because the mean of its divisors is an integer number (74861055).

Almost surely, 2^249536845 is an apocalyptic number.

It is an amenable number.

249536845 is a deficient number, since it is larger than the sum of its proper divisors (49907375).

249536845 is an equidigital number, since it uses as much as digits as its factorization.

249536845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49907374.

The product of its digits is 1036800, while the sum is 46.

The square root of 249536845 is about 15796.7352639715. The cubic root of 249536845 is about 629.5712586383.

It can be divided in two parts, 2495 and 36845, that added together give a triangular number (39340 = T₂₈₀).

The spelling of 249536845 in words is "two hundred forty-nine million, five hundred thirty-six thousand, eight hundred forty-five".