161131169 has 4 divisors (see below), whose sum is σ = 168136896. Its totient is φ = 154125444.

The previous prime is 161131147. The next prime is 161131213. The reversal of 161131169 is 961131161.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 961131161 = 31 ⋅31004231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161131169 is a prime.

It is a super-2 number, since 2×161131169² = 51926507246613122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161131109) 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 in 3 ways as a sum of consecutive naturals, for example, 3502829 + ... + 3502874.

It is an arithmetic number, because the mean of its divisors is an integer number (42034224).

Almost surely, 2^161131169 is an apocalyptic number.

It is an amenable number.

161131169 is a deficient number, since it is larger than the sum of its proper divisors (7005727).

161131169 is an equidigital number, since it uses as much as digits as its factorization.

161131169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7005726.

The product of its digits is 972, while the sum is 29.

The square root of 161131169 is about 12693.7452708017. The cubic root of 161131169 is about 544.1598806037.

The spelling of 161131169 in words is "one hundred sixty-one million, one hundred thirty-one thousand, one hundred sixty-nine".