161323003 has 2 divisors, whose sum is σ = 161323004. Its totient is φ = 161323002.

The previous prime is 161322991. The next prime is 161323021. The reversal of 161323003 is 300323161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161323003 - 2²¹ = 159225851 is a prime.

It is a super-2 number, since 2×161323003² = 52050222593876018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161323073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80661501 + 80661502.

It is an arithmetic number, because the mean of its divisors is an integer number (80661502).

Almost surely, 2^161323003 is an apocalyptic number.

161323003 is a deficient number, since it is larger than the sum of its proper divisors (1).

161323003 is an equidigital number, since it uses as much as digits as its factorization.

161323003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 161323003 is about 12701.2992642485. The cubic root of 161323003 is about 544.3757440070.

Adding to 161323003 its reverse (300323161), we get a palindrome (461646164).

The spelling of 161323003 in words is "one hundred sixty-one million, three hundred twenty-three thousand, three".