181906049 has 4 divisors (see below), whose sum is σ = 195898836. Its totient is φ = 167913264.

The previous prime is 181905973. The next prime is 181906051. The reversal of 181906049 is 940609181.

It is a happy number.

181906049 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, and also an emirpimes, since its reverse is a distinct semiprime: 940609181 = 67 ⋅14038943.

It can be written as a sum of positive squares in 2 ways, for example, as 35617024 + 146289025 = 5968^2 + 12095^2 .

It is a cyclic number.

It is not a de Polignac number, because 181906049 - 2⁸ = 181905793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181906079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6996374 + ... + 6996399.

It is an arithmetic number, because the mean of its divisors is an integer number (48974709).

Almost surely, 2^181906049 is an apocalyptic number.

It is an amenable number.

181906049 is a deficient number, since it is larger than the sum of its proper divisors (13992787).

181906049 is a wasteful number, since it uses less digits than its factorization.

181906049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13992786.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 181906049 is about 13487.2550580168. The cubic root of 181906049 is about 566.6075802676.

The spelling of 181906049 in words is "one hundred eighty-one million, nine hundred six thousand, forty-nine".