181533061 has 2 divisors, whose sum is σ = 181533062. Its totient is φ = 181533060.

The previous prime is 181533059. The next prime is 181533067. The reversal of 181533061 is 160335181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172108161 + 9424900 = 13119^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 181533061 - 2¹ = 181533059 is a prime.

Together with 181533059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181533067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90766530 + 90766531.

It is an arithmetic number, because the mean of its divisors is an integer number (90766531).

Almost surely, 2^181533061 is an apocalyptic number.

It is an amenable number.

181533061 is a deficient number, since it is larger than the sum of its proper divisors (1).

181533061 is an equidigital number, since it uses as much as digits as its factorization.

181533061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 181533061 is about 13473.4205382301. The cubic root of 181533061 is about 566.2200497457.

The spelling of 181533061 in words is "one hundred eighty-one million, five hundred thirty-three thousand, sixty-one".