161344639 has 2 divisors, whose sum is σ = 161344640. Its totient is φ = 161344638.

The previous prime is 161344607. The next prime is 161344649. The reversal of 161344639 is 936443161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161344639 - 2⁵ = 161344607 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161344598 and 161344607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161344649) 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, 80672319 + 80672320.

It is an arithmetic number, because the mean of its divisors is an integer number (80672320).

Almost surely, 2^161344639 is an apocalyptic number.

161344639 is a deficient number, since it is larger than the sum of its proper divisors (1).

161344639 is an equidigital number, since it uses as much as digits as its factorization.

161344639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 161344639 is about 12702.1509595816. The cubic root of 161344639 is about 544.4000794229.

The spelling of 161344639 in words is "one hundred sixty-one million, three hundred forty-four thousand, six hundred thirty-nine".