161517541 has 2 divisors, whose sum is σ = 161517542. Its totient is φ = 161517540.

The previous prime is 161517529. The next prime is 161517581. The reversal of 161517541 is 145715161.

161517541 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118352641 + 43164900 = 10879^2 + 6570^2 .

It is a cyclic number.

It is not a de Polignac number, because 161517541 - 2⁵ = 161517509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161517581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80758770 + 80758771.

It is an arithmetic number, because the mean of its divisors is an integer number (80758771).

Almost surely, 2^161517541 is an apocalyptic number.

It is an amenable number.

161517541 is a deficient number, since it is larger than the sum of its proper divisors (1).

161517541 is an equidigital number, since it uses as much as digits as its factorization.

161517541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 31.

The square root of 161517541 is about 12708.9551498146. The cubic root of 161517541 is about 544.5944754265.

The spelling of 161517541 in words is "one hundred sixty-one million, five hundred seventeen thousand, five hundred forty-one".