42003161 has 4 divisors (see below), whose sum is σ = 42028800. Its totient is φ = 41977524.

The previous prime is 42003149. The next prime is 42003163. The reversal of 42003161 is 16130024.

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 42003161 - 2⁶ = 42003097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42003163) 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, 10181 + ... + 13698.

It is an arithmetic number, because the mean of its divisors is an integer number (10507200).

Almost surely, 2^42003161 is an apocalyptic number.

It is an amenable number.

42003161 is a deficient number, since it is larger than the sum of its proper divisors (25639).

42003161 is a wasteful number, since it uses less digits than its factorization.

42003161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25638.

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

The square root of 42003161 is about 6480.9845702640. The cubic root of 42003161 is about 347.6113846828.

Adding to 42003161 its reverse (16130024), we get a palindrome (58133185).

The spelling of 42003161 in words is "forty-two million, three thousand, one hundred sixty-one".