161117771 has 8 divisors (see below), whose sum is σ = 162084864. Its totient is φ = 160154280.

The previous prime is 161117767. The next prime is 161117791. The reversal of 161117771 is 177711161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161117771 - 2² = 161117767 is a prime.

It is a super-2 number, since 2×161117771² = 51917872264016882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161117791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162086 + ... + 163076.

It is an arithmetic number, because the mean of its divisors is an integer number (20260608).

Almost surely, 2^161117771 is an apocalyptic number.

161117771 is a deficient number, since it is larger than the sum of its proper divisors (967093).

161117771 is an equidigital number, since it uses as much as digits as its factorization.

161117771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801.

The product of its digits is 2058, while the sum is 32.

The square root of 161117771 is about 12693.2175196047. The cubic root of 161117771 is about 544.1447979515.

The spelling of 161117771 in words is "one hundred sixty-one million, one hundred seventeen thousand, seven hundred seventy-one".