161109771 has 16 divisors (see below), whose sum is σ = 219732480. Its totient is φ = 104963040.

The previous prime is 161109763. The next prime is 161109791. The reversal of 161109771 is 177901161.

It is a happy number.

161109771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161109771 - 2³ = 161109763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161109701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41220 + ... + 44958.

It is an arithmetic number, because the mean of its divisors is an integer number (13733280).

Almost surely, 2^161109771 is an apocalyptic number.

161109771 is a deficient number, since it is larger than the sum of its proper divisors (58622709).

161109771 is a wasteful number, since it uses less digits than its factorization.

161109771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066.

The product of its (nonzero) digits is 2646, while the sum is 33.

The square root of 161109771 is about 12692.9023867672. The cubic root of 161109771 is about 544.1357916401.

The spelling of 161109771 in words is "one hundred sixty-one million, one hundred nine thousand, seven hundred seventy-one".