161508803 has 2 divisors, whose sum is σ = 161508804. Its totient is φ = 161508802.

The previous prime is 161508761. The next prime is 161508833. The reversal of 161508803 is 308805161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161508803 - 2²⁰ = 160460227 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161508803.

It is not a weakly prime, because it can be changed into another prime (161508833) 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, 80754401 + 80754402.

It is an arithmetic number, because the mean of its divisors is an integer number (80754402).

Almost surely, 2^161508803 is an apocalyptic number.

161508803 is a deficient number, since it is larger than the sum of its proper divisors (1).

161508803 is an equidigital number, since it uses as much as digits as its factorization.

161508803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 161508803 is about 12708.6113718219. The cubic root of 161508803 is about 544.5846545069.

The spelling of 161508803 in words is "one hundred sixty-one million, five hundred eight thousand, eight hundred three".