161402203 has 4 divisors (see below), whose sum is σ = 161587120. Its totient is φ = 161217288.

The previous prime is 161402179. The next prime is 161402209. The reversal of 161402203 is 302204161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161402203 is a prime.

It is a super-2 number, since 2×161402203² = 52101342266506418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161402209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91143 + ... + 92896.

It is an arithmetic number, because the mean of its divisors is an integer number (40396780).

Almost surely, 2^161402203 is an apocalyptic number.

161402203 is a deficient number, since it is larger than the sum of its proper divisors (184917).

161402203 is an equidigital number, since it uses as much as digits as its factorization.

161402203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184916.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 161402203 is about 12704.4166729528. The cubic root of 161402203 is about 544.4648148039.

Adding to 161402203 its reverse (302204161), we get a palindrome (463606364).

The spelling of 161402203 in words is "one hundred sixty-one million, four hundred two thousand, two hundred three".