161505359 has 2 divisors, whose sum is σ = 161505360. Its totient is φ = 161505358.

The previous prime is 161505353. The next prime is 161505397. The reversal of 161505359 is 953505161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161505359 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161505353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80752679 + 80752680.

It is an arithmetic number, because the mean of its divisors is an integer number (80752680).

Almost surely, 2^161505359 is an apocalyptic number.

161505359 is a deficient number, since it is larger than the sum of its proper divisors (1).

161505359 is an equidigital number, since it uses as much as digits as its factorization.

161505359 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 161505359 is about 12708.4758724247. The cubic root of 161505359 is about 544.5807835871.

The spelling of 161505359 in words is "one hundred sixty-one million, five hundred five thousand, three hundred fifty-nine".