161091069 has 4 divisors (see below), whose sum is σ = 214788096. Its totient is φ = 107394044.

The previous prime is 161091067. The next prime is 161091083. The reversal of 161091069 is 960190161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161091069 - 2¹ = 161091067 is a prime.

It is a super-2 number, since 2×161091069² = 51900665023125522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161091067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26848509 + ... + 26848514.

It is an arithmetic number, because the mean of its divisors is an integer number (53697024).

Almost surely, 2^161091069 is an apocalyptic number.

It is an amenable number.

161091069 is a deficient number, since it is larger than the sum of its proper divisors (53697027).

161091069 is an equidigital number, since it uses as much as digits as its factorization.

161091069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53697026.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 161091069 is about 12692.1656544500. The cubic root of 161091069 is about 544.1147359725.

The spelling of 161091069 in words is "one hundred sixty-one million, ninety-one thousand, sixty-nine".