181286961 has 8 divisors (see below), whose sum is σ = 254437920. Its totient is φ = 114496992.

The previous prime is 181286957. The next prime is 181286969. The reversal of 181286961 is 169682181.

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

It is not a de Polignac number, because 181286961 - 2² = 181286957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181286969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1590180 + ... + 1590293.

It is an arithmetic number, because the mean of its divisors is an integer number (31804740).

Almost surely, 2^181286961 is an apocalyptic number.

It is an amenable number.

181286961 is a deficient number, since it is larger than the sum of its proper divisors (73150959).

181286961 is a wasteful number, since it uses less digits than its factorization.

181286961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180495.

The product of its digits is 41472, while the sum is 42.

The square root of 181286961 is about 13464.2846449412. The cubic root of 181286961 is about 565.9640637366.

The spelling of 181286961 in words is "one hundred eighty-one million, two hundred eighty-six thousand, nine hundred sixty-one".