161517241 has 2 divisors, whose sum is σ = 161517242. Its totient is φ = 161517240.

The previous prime is 161517229. The next prime is 161517259. The reversal of 161517241 is 142715161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129481641 + 32035600 = 11379^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 161517241 - 2⁷ = 161517113 is a prime.

It is not a weakly prime, because it can be changed into another prime (161517541) 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, 80758620 + 80758621.

It is an arithmetic number, because the mean of its divisors is an integer number (80758621).

Almost surely, 2^161517241 is an apocalyptic number.

It is an amenable number.

161517241 is a deficient number, since it is larger than the sum of its proper divisors (1).

161517241 is an equidigital number, since it uses as much as digits as its factorization.

161517241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 161517241 is about 12708.9433471080. The cubic root of 161517241 is about 544.5941382527.

The spelling of 161517241 in words is "one hundred sixty-one million, five hundred seventeen thousand, two hundred forty-one".