161508833 has 2 divisors, whose sum is σ = 161508834. Its totient is φ = 161508832.

The previous prime is 161508803. The next prime is 161508839. The reversal of 161508833 is 338805161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104611984 + 56896849 = 10228^2 + 7543^2 .

It is a cyclic number.

It is not a de Polignac number, because 161508833 - 2⁸ = 161508577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161508793 and 161508802.

It is not a weakly prime, because it can be changed into another prime (161508839) 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, 80754416 + 80754417.

It is an arithmetic number, because the mean of its divisors is an integer number (80754417).

Almost surely, 2^161508833 is an apocalyptic number.

It is an amenable number.

161508833 is a deficient number, since it is larger than the sum of its proper divisors (1).

161508833 is an equidigital number, since it uses as much as digits as its factorization.

161508833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 161508833 is about 12708.6125521239. The cubic root of 161508833 is about 544.5846882255.

The spelling of 161508833 in words is "one hundred sixty-one million, five hundred eight thousand, eight hundred thirty-three".