161230331 has 4 divisors (see below), whose sum is σ = 161547600. Its totient is φ = 160913064.

The previous prime is 161230319. The next prime is 161230357. The reversal of 161230331 is 133032161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133032161 = 23 ⋅5784007.

It is a cyclic number.

It is not a de Polignac number, because 161230331 - 2¹⁴ = 161213947 is a prime.

It is a super-2 number, since 2×161230331² = 51990439268739122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161530331) 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, 157871 + ... + 158888.

It is an arithmetic number, because the mean of its divisors is an integer number (40386900).

Almost surely, 2^161230331 is an apocalyptic number.

161230331 is a deficient number, since it is larger than the sum of its proper divisors (317269).

161230331 is an equidigital number, since it uses as much as digits as its factorization.

161230331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317268.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 161230331 is about 12697.6506094632. The cubic root of 161230331 is about 544.2714851575.

Adding to 161230331 its reverse (133032161), we get a palindrome (294262492).

The spelling of 161230331 in words is "one hundred sixty-one million, two hundred thirty thousand, three hundred thirty-one".