161055091 has 2 divisors, whose sum is σ = 161055092. Its totient is φ = 161055090.

The previous prime is 161055079. The next prime is 161055101. The reversal of 161055091 is 190550161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161055091 - 2¹⁷ = 160924019 is a prime.

It is not a weakly prime, because it can be changed into another prime (161055031) 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, 80527545 + 80527546.

It is an arithmetic number, because the mean of its divisors is an integer number (80527546).

Almost surely, 2^161055091 is an apocalyptic number.

161055091 is a deficient number, since it is larger than the sum of its proper divisors (1).

161055091 is an equidigital number, since it uses as much as digits as its factorization.

161055091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 161055091 is about 12690.7482442920. The cubic root of 161055091 is about 544.0742255175.

The spelling of 161055091 in words is "one hundred sixty-one million, fifty-five thousand, ninety-one".