249485261549 has 4 divisors (see below), whose sum is σ = 251693095836. Its totient is φ = 247277427264.

The previous prime is 249485261521. The next prime is 249485261593. The reversal of 249485261549 is 945162584942.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9010755625 + 240474505924 = 94925^2 + 490382^2 .

It is a cyclic number.

It is not a de Polignac number, because 249485261549 - 2¹⁶ = 249485196013 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 (249485261749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103916974 + ... + 1103917199.

It is an arithmetic number, because the mean of its divisors is an integer number (62923273959).

Almost surely, 2^249485261549 is an apocalyptic number.

It is an amenable number.

249485261549 is a deficient number, since it is larger than the sum of its proper divisors (2207834287).

249485261549 is a wasteful number, since it uses less digits than its factorization.

249485261549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207834286.

The product of its digits is 24883200, while the sum is 59.

The spelling of 249485261549 in words is "two hundred forty-nine billion, four hundred eighty-five million, two hundred sixty-one thousand, five hundred forty-nine".