161232139 has 8 divisors (see below), whose sum is σ = 169979040. Its totient is φ = 152630016.

The previous prime is 161232121. The next prime is 161232163. The reversal of 161232139 is 931232161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161232139 - 2¹⁷ = 161101067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161232179) 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 7 ways as a sum of consecutive naturals, for example, 33904 + ... + 38365.

It is an arithmetic number, because the mean of its divisors is an integer number (21247380).

Almost surely, 2^161232139 is an apocalyptic number.

161232139 is a deficient number, since it is larger than the sum of its proper divisors (8746901).

161232139 is an equidigital number, since it uses as much as digits as its factorization.

161232139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72389.

The product of its digits is 1944, while the sum is 28.

The square root of 161232139 is about 12697.7218035363. The cubic root of 161232139 is about 544.2735195952.

The spelling of 161232139 in words is "one hundred sixty-one million, two hundred thirty-two thousand, one hundred thirty-nine".