161042003 has 4 divisors (see below), whose sum is σ = 170515080. Its totient is φ = 151568928.

The previous prime is 161041963. The next prime is 161042033. The reversal of 161042003 is 300240161.

161042003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161042003 - 2⁶ = 161041939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 9473059 = 161042003 / (1 + 6 + 1 + 0 + 4 + 2 + 0 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161042033) 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, 4736513 + ... + 4736546.

It is an arithmetic number, because the mean of its divisors is an integer number (42628770).

Almost surely, 2^161042003 is an apocalyptic number.

161042003 is a deficient number, since it is larger than the sum of its proper divisors (9473077).

161042003 is an equidigital number, since it uses as much as digits as its factorization.

161042003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473076.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 161042003 is about 12690.2325825810. The cubic root of 161042003 is about 544.0594872141.

Adding to 161042003 its reverse (300240161), we get a palindrome (461282164).

The spelling of 161042003 in words is "one hundred sixty-one million, forty-two thousand, three".