249511123 has 4 divisors (see below), whose sum is σ = 250104208. Its totient is φ = 248918040.

The previous prime is 249511081. The next prime is 249511127. The reversal of 249511123 is 321115942.

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 249511123 - 2¹⁷ = 249380051 is a prime.

It is a super-2 number, since 2×249511123² = 124511601001442258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249511091 and 249511100.

It is not an unprimeable number, because it can be changed into a prime (249511127) 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, 295911 + ... + 296752.

It is an arithmetic number, because the mean of its divisors is an integer number (62526052).

Almost surely, 2^249511123 is an apocalyptic number.

249511123 is a deficient number, since it is larger than the sum of its proper divisors (593085).

249511123 is an equidigital number, since it uses as much as digits as its factorization.

249511123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593084.

The product of its digits is 2160, while the sum is 28.

The square root of 249511123 is about 15795.9210874200. The cubic root of 249511123 is about 629.5496260435.

The spelling of 249511123 in words is "two hundred forty-nine million, five hundred eleven thousand, one hundred twenty-three".