181306733 has 2 divisors, whose sum is σ = 181306734. Its totient is φ = 181306732.

The previous prime is 181306673. The next prime is 181306781. The reversal of 181306733 is 337603181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180687364 + 619369 = 13442^2 + 787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181306733 is a prime.

It is a super-2 number, since 2×181306733² = 65744262862266578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181306733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181306133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90653366 + 90653367.

It is an arithmetic number, because the mean of its divisors is an integer number (90653367).

Almost surely, 2^181306733 is an apocalyptic number.

It is an amenable number.

181306733 is a deficient number, since it is larger than the sum of its proper divisors (1).

181306733 is an equidigital number, since it uses as much as digits as its factorization.

181306733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 181306733 is about 13465.0188637075. The cubic root of 181306733 is about 565.9846385472.

The spelling of 181306733 in words is "one hundred eighty-one million, three hundred six thousand, seven hundred thirty-three".