249117881 has 8 divisors (see below), whose sum is σ = 264345120. Its totient is φ = 233954368.

The previous prime is 249117871. The next prime is 249117901. The reversal of 249117881 is 188711942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249117881 is a prime.

It is a super-2 number, since 2×249117881² = 124119437267860322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249117811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7751 + ... + 23628.

It is an arithmetic number, because the mean of its divisors is an integer number (33043140).

Almost surely, 2^249117881 is an apocalyptic number.

It is an amenable number.

249117881 is a deficient number, since it is larger than the sum of its proper divisors (15227239).

249117881 is a wasteful number, since it uses less digits than its factorization.

249117881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31863.

The product of its digits is 32256, while the sum is 41.

The square root of 249117881 is about 15783.4685985052. The cubic root of 249117881 is about 629.2187182487.

The spelling of 249117881 in words is "two hundred forty-nine million, one hundred seventeen thousand, eight hundred eighty-one".