161895427 has 2 divisors, whose sum is σ = 161895428. Its totient is φ = 161895426.

The previous prime is 161895421. The next prime is 161895451. The reversal of 161895427 is 724598161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161895427 - 2¹⁹ = 161371139 is a prime.

It is not a weakly prime, because it can be changed into another prime (161895421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80947713 + 80947714.

It is an arithmetic number, because the mean of its divisors is an integer number (80947714).

Almost surely, 2^161895427 is an apocalyptic number.

161895427 is a deficient number, since it is larger than the sum of its proper divisors (1).

161895427 is an equidigital number, since it uses as much as digits as its factorization.

161895427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 161895427 is about 12723.8133827874. The cubic root of 161895427 is about 545.0188552240.

The spelling of 161895427 in words is "one hundred sixty-one million, eight hundred ninety-five thousand, four hundred twenty-seven".