249623225281 has 4 divisors (see below), whose sum is σ = 253715409364. Its totient is φ = 245531041200.

The previous prime is 249623225279. The next prime is 249623225339. The reversal of 249623225281 is 182522326942.

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 98099877681 + 151523347600 = 313209^2 + 389260^2 .

It is a cyclic number.

It is not a de Polignac number, because 249623225281 - 2¹ = 249623225279 is a prime.

It is a super-2 number, since 2×249623225281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249623225231) 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, 2046091950 + ... + 2046092071.

It is an arithmetic number, because the mean of its divisors is an integer number (63428852341).

Almost surely, 2^249623225281 is an apocalyptic number.

It is an amenable number.

249623225281 is a deficient number, since it is larger than the sum of its proper divisors (4092184083).

249623225281 is an equidigital number, since it uses as much as digits as its factorization.

249623225281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092184082.

The product of its digits is 829440, while the sum is 46.

The spelling of 249623225281 in words is "two hundred forty-nine billion, six hundred twenty-three million, two hundred twenty-five thousand, two hundred eighty-one".