161623339 has 2 divisors, whose sum is σ = 161623340. Its totient is φ = 161623338.

The previous prime is 161623333. The next prime is 161623417. The reversal of 161623339 is 933326161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161623339 - 2⁵ = 161623307 is a prime.

It is a super-2 number, since 2×161623339² = 52244207419017842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161623333) 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 as a sum of consecutive naturals, namely, 80811669 + 80811670.

It is an arithmetic number, because the mean of its divisors is an integer number (80811670).

Almost surely, 2^161623339 is an apocalyptic number.

161623339 is a deficient number, since it is larger than the sum of its proper divisors (1).

161623339 is an equidigital number, since it uses as much as digits as its factorization.

161623339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 34.

The square root of 161623339 is about 12713.1168090284. The cubic root of 161623339 is about 544.7133571082.

The spelling of 161623339 in words is "one hundred sixty-one million, six hundred twenty-three thousand, three hundred thirty-nine".