161140081 has 4 divisors (see below), whose sum is σ = 161179200. Its totient is φ = 161100964.

The previous prime is 161140079. The next prime is 161140097. The reversal of 161140081 is 180041161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161140081 - 2¹ = 161140079 is a prime.

It is a super-2 number, since 2×161140081² = 51932251409373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161140061) 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, 12541 + ... + 21898.

It is an arithmetic number, because the mean of its divisors is an integer number (40294800).

Almost surely, 2^161140081 is an apocalyptic number.

It is an amenable number.

161140081 is a deficient number, since it is larger than the sum of its proper divisors (39119).

161140081 is an equidigital number, since it uses as much as digits as its factorization.

161140081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39118.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 161140081 is about 12694.0963049758. The cubic root of 161140081 is about 544.1699127274.

The spelling of 161140081 in words is "one hundred sixty-one million, one hundred forty thousand, eighty-one".