161575091 has 2 divisors, whose sum is σ = 161575092. Its totient is φ = 161575090.

The previous prime is 161575079. The next prime is 161575103. The reversal of 161575091 is 190575161.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (161575079) and next prime (161575103).

It is a cyclic number.

It is not a de Polignac number, because 161575091 - 2⁶ = 161575027 is a prime.

It is a super-2 number, since 2×161575091² = 52213020063316562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161575291) 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, 80787545 + 80787546.

It is an arithmetic number, because the mean of its divisors is an integer number (80787546).

Almost surely, 2^161575091 is an apocalyptic number.

161575091 is a deficient number, since it is larger than the sum of its proper divisors (1).

161575091 is an equidigital number, since it uses as much as digits as its factorization.

161575091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 35.

The square root of 161575091 is about 12711.2190996773. The cubic root of 161575091 is about 544.6591488776.

The spelling of 161575091 in words is "one hundred sixty-one million, five hundred seventy-five thousand, ninety-one".