181045961 has 2 divisors, whose sum is σ = 181045962. Its totient is φ = 181045960.

The previous prime is 181045951. The next prime is 181045973. The reversal of 181045961 is 169540181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179560000 + 1485961 = 13400^2 + 1219^2 .

It is an emirp because it is prime and its reverse (169540181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181045961 - 2⁶ = 181045897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (181045901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90522980 + 90522981.

It is an arithmetic number, because the mean of its divisors is an integer number (90522981).

Almost surely, 2^181045961 is an apocalyptic number.

It is an amenable number.

181045961 is a deficient number, since it is larger than the sum of its proper divisors (1).

181045961 is an equidigital number, since it uses as much as digits as its factorization.

181045961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 181045961 is about 13455.3320657649. The cubic root of 181045961 is about 565.7131579815.

The spelling of 181045961 in words is "one hundred eighty-one million, forty-five thousand, nine hundred sixty-one".