161181187 has 2 divisors, whose sum is σ = 161181188. Its totient is φ = 161181186.

The previous prime is 161181173. The next prime is 161181193. The reversal of 161181187 is 781181161.

161181187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161181187 is a prime.

It is not a weakly prime, because it can be changed into another prime (161181107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80590593 + 80590594.

It is an arithmetic number, because the mean of its divisors is an integer number (80590594).

Almost surely, 2^161181187 is an apocalyptic number.

161181187 is a deficient number, since it is larger than the sum of its proper divisors (1).

161181187 is an equidigital number, since it uses as much as digits as its factorization.

161181187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 34.

The square root of 161181187 is about 12695.7153008407. The cubic root of 161181187 is about 544.2161804355.

The spelling of 161181187 in words is "one hundred sixty-one million, one hundred eighty-one thousand, one hundred eighty-seven".