161225833 has 2 divisors, whose sum is σ = 161225834. Its totient is φ = 161225832.

The previous prime is 161225809. The next prime is 161225873. The reversal of 161225833 is 338522161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102657424 + 58568409 = 10132^2 + 7653^2 .

It is an emirp because it is prime and its reverse (338522161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161225833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161225795 and 161225804.

It is not a weakly prime, because it can be changed into another prime (161225873) 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, 80612916 + 80612917.

It is an arithmetic number, because the mean of its divisors is an integer number (80612917).

Almost surely, 2^161225833 is an apocalyptic number.

It is an amenable number.

161225833 is a deficient number, since it is larger than the sum of its proper divisors (1).

161225833 is an equidigital number, since it uses as much as digits as its factorization.

161225833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 161225833 is about 12697.4734888481. The cubic root of 161225833 is about 544.2664237528.

Adding to 161225833 its reverse (338522161), we get a palindrome (499747994).

The spelling of 161225833 in words is "one hundred sixty-one million, two hundred twenty-five thousand, eight hundred thirty-three".