161602003 has 4 divisors (see below), whose sum is σ = 164341080. Its totient is φ = 158862928.

The previous prime is 161601991. The next prime is 161602013. The reversal of 161602003 is 300206161.

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

It is not a de Polignac number, because 161602003 - 2⁹ = 161601491 is a prime.

It is a super-2 number, since 2×161602003² = 52230414747224018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161602013) 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, 1369450 + ... + 1369567.

It is an arithmetic number, because the mean of its divisors is an integer number (41085270).

Almost surely, 2^161602003 is an apocalyptic number.

161602003 is a deficient number, since it is larger than the sum of its proper divisors (2739077).

161602003 is an equidigital number, since it uses as much as digits as its factorization.

161602003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739076.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 161602003 is about 12712.2776480063. The cubic root of 161602003 is about 544.6893867342.

Adding to 161602003 its reverse (300206161), we get a palindrome (461808164).

The spelling of 161602003 in words is "one hundred sixty-one million, six hundred two thousand, three".