249616081 has 16 divisors (see below), whose sum is σ = 295081920. Its totient is φ = 208163520.

The previous prime is 249616067. The next prime is 249616093. The reversal of 249616081 is 180616942.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 249616081 - 2²⁵ = 216061649 is a prime.

It is a super-2 number, since 2×249616081² = 124616375787597122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249616081.

It is not an unprimeable number, because it can be changed into a prime (249616781) 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, 17955 + ... + 28663.

It is an arithmetic number, because the mean of its divisors is an integer number (18442620).

Almost surely, 2^249616081 is an apocalyptic number.

It is an amenable number.

249616081 is a deficient number, since it is larger than the sum of its proper divisors (45465839).

249616081 is a wasteful number, since it uses less digits than its factorization.

249616081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10896.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 249616081 is about 15799.2430514883. The cubic root of 249616081 is about 629.6378879827.

The spelling of 249616081 in words is "two hundred forty-nine million, six hundred sixteen thousand, eighty-one".