161601803 has 4 divisors (see below), whose sum is σ = 176292888. Its totient is φ = 146910720.

The previous prime is 161601761. The next prime is 161601809. The reversal of 161601803 is 308106161.

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

It is not a de Polignac number, because 161601803 - 2¹⁶ = 161536267 is a prime.

It is a super-2 number, since 2×161601803² = 52230285465701618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161601809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7345526 + ... + 7345547.

It is an arithmetic number, because the mean of its divisors is an integer number (44073222).

Almost surely, 2^161601803 is an apocalyptic number.

161601803 is a deficient number, since it is larger than the sum of its proper divisors (14691085).

161601803 is a wasteful number, since it uses less digits than its factorization.

161601803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14691084.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 161601803 is about 12712.2697815929. The cubic root of 161601803 is about 544.6891620301.

Adding to 161601803 its reverse (308106161), we get a palindrome (469707964).

The spelling of 161601803 in words is "one hundred sixty-one million, six hundred one thousand, eight hundred three".