161181193 has 2 divisors, whose sum is σ = 161181194. Its totient is φ = 161181192.

The previous prime is 161181187. The next prime is 161181227. The reversal of 161181193 is 391181161.

161181193 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., 136609344 + 24571849 = 11688^2 + 4957^2 .

It is a cyclic number.

It is not a de Polignac number, because 161181193 - 2¹⁷ = 161050121 is a prime.

It is not a weakly prime, because it can be changed into another prime (161181143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80590596 + 80590597.

It is an arithmetic number, because the mean of its divisors is an integer number (80590597).

Almost surely, 2^161181193 is an apocalyptic number.

It is an amenable number.

161181193 is a deficient number, since it is larger than the sum of its proper divisors (1).

161181193 is an equidigital number, since it uses as much as digits as its factorization.

161181193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 31.

The square root of 161181193 is about 12695.7155371409. The cubic root of 161181193 is about 544.2161871883.

The spelling of 161181193 in words is "one hundred sixty-one million, one hundred eighty-one thousand, one hundred ninety-three".