161141691 has 8 divisors (see below), whose sum is σ = 227494224. Its totient is φ = 101108480.

The previous prime is 161141681. The next prime is 161141699. The reversal of 161141691 is 196141161.

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 161141691 - 2¹⁰ = 161140667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161141699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579770 + ... + 1579871.

It is an arithmetic number, because the mean of its divisors is an integer number (28436778).

Almost surely, 2^161141691 is an apocalyptic number.

161141691 is a deficient number, since it is larger than the sum of its proper divisors (66352533).

161141691 is a wasteful number, since it uses less digits than its factorization.

161141691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159661.

The product of its digits is 1296, while the sum is 30.

The square root of 161141691 is about 12694.1597201233. The cubic root of 161141691 is about 544.1717250443.

The spelling of 161141691 in words is "one hundred sixty-one million, one hundred forty-one thousand, six hundred ninety-one".