161119771 has 4 divisors (see below), whose sum is σ = 161429544. Its totient is φ = 160810000.

The previous prime is 161119759. The next prime is 161119787. The reversal of 161119771 is 177911161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177911161 = 71 ⋅2505791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161119771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161119171) 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, 154105 + ... + 155146.

It is an arithmetic number, because the mean of its divisors is an integer number (40357386).

Almost surely, 2^161119771 is an apocalyptic number.

161119771 is a deficient number, since it is larger than the sum of its proper divisors (309773).

161119771 is an equidigital number, since it uses as much as digits as its factorization.

161119771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309772.

The product of its digits is 2646, while the sum is 34.

The square root of 161119771 is about 12693.2963015916. The cubic root of 161119771 is about 544.1470494828.

The spelling of 161119771 in words is "one hundred sixty-one million, one hundred nineteen thousand, seven hundred seventy-one".