181590121 has 2 divisors, whose sum is σ = 181590122. Its totient is φ = 181590120.

The previous prime is 181590113. The next prime is 181590169. The reversal of 181590121 is 121095181.

181590121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133148521 + 48441600 = 11539^2 + 6960^2 .

It is a cyclic number.

It is not a de Polignac number, because 181590121 - 2³ = 181590113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181590121.

It is not a weakly prime, because it can be changed into another prime (181560121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90795060 + 90795061.

It is an arithmetic number, because the mean of its divisors is an integer number (90795061).

Almost surely, 2^181590121 is an apocalyptic number.

It is an amenable number.

181590121 is a deficient number, since it is larger than the sum of its proper divisors (1).

181590121 is an equidigital number, since it uses as much as digits as its factorization.

181590121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 181590121 is about 13475.5378742372. The cubic root of 181590121 is about 566.2793688422.

The spelling of 181590121 in words is "one hundred eighty-one million, five hundred ninety thousand, one hundred twenty-one".