161845043 has 4 divisors (see below), whose sum is σ = 168881808. Its totient is φ = 154808280.

The previous prime is 161845039. The next prime is 161845069. The reversal of 161845043 is 340548161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161845043 - 2² = 161845039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161845643) 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, 3518348 + ... + 3518393.

It is an arithmetic number, because the mean of its divisors is an integer number (42220452).

Almost surely, 2^161845043 is an apocalyptic number.

161845043 is a deficient number, since it is larger than the sum of its proper divisors (7036765).

161845043 is an equidigital number, since it uses as much as digits as its factorization.

161845043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036764.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 161845043 is about 12721.8333191408. The cubic root of 161845043 is about 544.9623103302.

The spelling of 161845043 in words is "one hundred sixty-one million, eight hundred forty-five thousand, forty-three".