181896081 has 4 divisors (see below), whose sum is σ = 242528112. Its totient is φ = 121264052.

The previous prime is 181896079. The next prime is 181896109. The reversal of 181896081 is 180698181.

181896081 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 181896081 - 2¹ = 181896079 is a prime.

It is a super-2 number, since 2×181896081² = 66172368566317122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181896031) 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, 30316011 + ... + 30316016.

It is an arithmetic number, because the mean of its divisors is an integer number (60632028).

Almost surely, 2^181896081 is an apocalyptic number.

It is an amenable number.

181896081 is a deficient number, since it is larger than the sum of its proper divisors (60632031).

181896081 is an equidigital number, since it uses as much as digits as its factorization.

181896081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60632030.

The product of its (nonzero) digits is 27648, while the sum is 42.

The square root of 181896081 is about 13486.8855189032. The cubic root of 181896081 is about 566.5972305155.

The spelling of 181896081 in words is "one hundred eighty-one million, eight hundred ninety-six thousand, eighty-one".