181045999 has 2 divisors, whose sum is σ = 181046000. Its totient is φ = 181045998.

The previous prime is 181045981. The next prime is 181046011. The reversal of 181045999 is 999540181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181045999 - 2¹⁷ = 180914927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181045979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90522999 + 90523000.

It is an arithmetic number, because the mean of its divisors is an integer number (90523000).

Almost surely, 2^181045999 is an apocalyptic number.

181045999 is a deficient number, since it is larger than the sum of its proper divisors (1).

181045999 is an equidigital number, since it uses as much as digits as its factorization.

181045999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 181045999 is about 13455.3334778444. Note that the first 3 decimals coincide. The cubic root of 181045999 is about 565.7131975610.

The spelling of 181045999 in words is "one hundred eighty-one million, forty-five thousand, nine hundred ninety-nine".