161505023 has 2 divisors, whose sum is σ = 161505024. Its totient is φ = 161505022.

The previous prime is 161504999. The next prime is 161505061. The reversal of 161505023 is 320505161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161505023 - 2²² = 157310719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161505023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161505623) 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 as a sum of consecutive naturals, namely, 80752511 + 80752512.

It is an arithmetic number, because the mean of its divisors is an integer number (80752512).

Almost surely, 2^161505023 is an apocalyptic number.

161505023 is a deficient number, since it is larger than the sum of its proper divisors (1).

161505023 is an equidigital number, since it uses as much as digits as its factorization.

161505023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 161505023 is about 12708.4626528939. The cubic root of 161505023 is about 544.5804059334.

The spelling of 161505023 in words is "one hundred sixty-one million, five hundred five thousand, twenty-three".