181649456 has 20 divisors (see below), whose sum is σ = 352165704. Its totient is φ = 90768000.

The previous prime is 181649449. The next prime is 181649459. The reversal of 181649456 is 654946181.

It is not an unprimeable number, because it can be changed into a prime (181649459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36731 + ... + 41381.

Almost surely, 2^181649456 is an apocalyptic number.

181649456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

181649456 is a deficient number, since it is larger than the sum of its proper divisors (170516248).

181649456 is a wasteful number, since it uses less digits than its factorization.

181649456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100 (or 7094 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 181649456 is about 13477.7392763030. The cubic root of 181649456 is about 566.3410398318.

The spelling of 181649456 in words is "one hundred eighty-one million, six hundred forty-nine thousand, four hundred fifty-six".