181132901 has 2 divisors, whose sum is σ = 181132902. Its totient is φ = 181132900.

The previous prime is 181132883. The next prime is 181132921. The reversal of 181132901 is 109231181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 23755876 = 12545^2 + 4874^2 .

It is a cyclic number.

It is not a de Polignac number, because 181132901 - 2⁶ = 181132837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181132921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90566450 + 90566451.

It is an arithmetic number, because the mean of its divisors is an integer number (90566451).

Almost surely, 2^181132901 is an apocalyptic number.

It is an amenable number.

181132901 is a deficient number, since it is larger than the sum of its proper divisors (1).

181132901 is an equidigital number, since it uses as much as digits as its factorization.

181132901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 181132901 is about 13458.5623675042. The cubic root of 181132901 is about 565.8036971114.

The spelling of 181132901 in words is "one hundred eighty-one million, one hundred thirty-two thousand, nine hundred one".