249801081 has 8 divisors (see below), whose sum is σ = 337284480. Its totient is φ = 164425872.

The previous prime is 249801073. The next prime is 249801089. The reversal of 249801081 is 180108942.

It is an interprime number because it is at equal distance from previous prime (249801073) and next prime (249801089).

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

It is not a de Polignac number, because 249801081 - 2³ = 249801073 is a prime.

It is a super-2 number, since 2×249801081² = 124801160137537122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (249801089) 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, 526770 + ... + 527243.

It is an arithmetic number, because the mean of its divisors is an integer number (42160560).

Almost surely, 2^249801081 is an apocalyptic number.

It is an amenable number.

249801081 is a deficient number, since it is larger than the sum of its proper divisors (87483399).

249801081 is a wasteful number, since it uses less digits than its factorization.

249801081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054095.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 249801081 is about 15805.0966779707. The cubic root of 249801081 is about 629.7933991234.

The spelling of 249801081 in words is "two hundred forty-nine million, eight hundred one thousand, eighty-one".