181894749 has 16 divisors (see below), whose sum is σ = 249134592. Its totient is φ = 118003248.

The previous prime is 181894721. The next prime is 181894753. The reversal of 181894749 is 947498181.

It is not a de Polignac number, because 181894749 - 2⁵ = 181894717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181894709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11232 + ... + 22134.

It is an arithmetic number, because the mean of its divisors is an integer number (15570912).

Almost surely, 2^181894749 is an apocalyptic number.

It is an amenable number.

181894749 is a deficient number, since it is larger than the sum of its proper divisors (67239843).

181894749 is a wasteful number, since it uses less digits than its factorization.

181894749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11056.

The product of its digits is 580608, while the sum is 51.

The square root of 181894749 is about 13486.8361375083. The cubic root of 181894749 is about 566.5958474742.

The spelling of 181894749 in words is "one hundred eighty-one million, eight hundred ninety-four thousand, seven hundred forty-nine".