181854994 has 4 divisors (see below), whose sum is σ = 272782494. Its totient is φ = 90927496.

The previous prime is 181854991. The next prime is 181855007. The reversal of 181854994 is 499458181.

181854994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 164172969 + 17682025 = 12813^2 + 4205^2 .

It is a Smith number, since the sum of its digits (49) 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 (181854991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45463747 + ... + 45463750.

Almost surely, 2^181854994 is an apocalyptic number.

181854994 is a deficient number, since it is larger than the sum of its proper divisors (90927500).

181854994 is an equidigital number, since it uses as much as digits as its factorization.

181854994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90927499.

The product of its digits is 414720, while the sum is 49.

The square root of 181854994 is about 13485.3622124139. The cubic root of 181854994 is about 566.5545659836.

The spelling of 181854994 in words is "one hundred eighty-one million, eight hundred fifty-four thousand, nine hundred ninety-four".