181359133 has 2 divisors, whose sum is σ = 181359134. Its totient is φ = 181359132.

The previous prime is 181359053. The next prime is 181359137. The reversal of 181359133 is 331953181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91431844 + 89927289 = 9562^2 + 9483^2 .

It is a cyclic number.

It is not a de Polignac number, because 181359133 - 2¹³ = 181350941 is a prime.

It is a super-2 number, since 2×181359133² = 65782270245023378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181359137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90679566 + 90679567.

It is an arithmetic number, because the mean of its divisors is an integer number (90679567).

Almost surely, 2^181359133 is an apocalyptic number.

It is an amenable number.

181359133 is a deficient number, since it is larger than the sum of its proper divisors (1).

181359133 is an equidigital number, since it uses as much as digits as its factorization.

181359133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 181359133 is about 13466.9645057823. The cubic root of 181359133 is about 566.0391589317.

The spelling of 181359133 in words is "one hundred eighty-one million, three hundred fifty-nine thousand, one hundred thirty-three".