249523261 has 6 divisors (see below), whose sum is σ = 270194010. Its totient is φ = 230329008.

The previous prime is 249523243. The next prime is 249523273. The reversal of 249523261 is 162325942.

It can be written as a sum of positive squares in 3 ways, for example, as 988036 + 248535225 = 994^2 + 15765^2 .

It is a de Polignac number, because none of the positive numbers 2^k-249523261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249523231) 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 5 ways as a sum of consecutive naturals, for example, 738066 + ... + 738403.

It is an arithmetic number, because the mean of its divisors is an integer number (45032335).

Almost surely, 2^249523261 is an apocalyptic number.

It is an amenable number.

249523261 is a deficient number, since it is larger than the sum of its proper divisors (20670749).

249523261 is a wasteful number, since it uses less digits than its factorization.

249523261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476495 (or 1476482 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 249523261 is about 15796.3052958595. The cubic root of 249523261 is about 629.5598344721.

The spelling of 249523261 in words is "two hundred forty-nine million, five hundred twenty-three thousand, two hundred sixty-one".