249138281 has 16 divisors (see below), whose sum is σ = 303523200. Its totient is φ = 199622400.

The previous prime is 249138251. The next prime is 249138283. The reversal of 249138281 is 182831942.

It is a cyclic number.

It is not a de Polignac number, because 249138281 - 2¹⁸ = 248876137 is a prime.

It is a super-2 number, since 2×249138281² = 124139766119269922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249138283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10706 + ... + 24756.

It is an arithmetic number, because the mean of its divisors is an integer number (18970200).

Almost surely, 2^249138281 is an apocalyptic number.

It is an amenable number.

249138281 is a deficient number, since it is larger than the sum of its proper divisors (54384919).

249138281 is a wasteful number, since it uses less digits than its factorization.

249138281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14224.

The product of its digits is 27648, while the sum is 38.

The square root of 249138281 is about 15784.1148310572. The cubic root of 249138281 is about 629.2358931318.

The spelling of 249138281 in words is "two hundred forty-nine million, one hundred thirty-eight thousand, two hundred eighty-one".