161788499 has 2 divisors, whose sum is σ = 161788500. Its totient is φ = 161788498.

The previous prime is 161788483. The next prime is 161788519. The reversal of 161788499 is 994887161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161788499 - 2⁴ = 161788483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161788499.

It is not a weakly prime, because it can be changed into another prime (161788399) 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, 80894249 + 80894250.

It is an arithmetic number, because the mean of its divisors is an integer number (80894250).

Almost surely, 2^161788499 is an apocalyptic number.

161788499 is a deficient number, since it is larger than the sum of its proper divisors (1).

161788499 is an equidigital number, since it uses as much as digits as its factorization.

161788499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 161788499 is about 12719.6108037943. The cubic root of 161788499 is about 544.8988382223.

The spelling of 161788499 in words is "one hundred sixty-one million, seven hundred eighty-eight thousand, four hundred ninety-nine".