161608541 has 2 divisors, whose sum is σ = 161608542. Its totient is φ = 161608540.

The previous prime is 161608519. The next prime is 161608571. The reversal of 161608541 is 145806161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155625625 + 5982916 = 12475^2 + 2446^2 .

It is a cyclic number.

It is not a de Polignac number, because 161608541 - 2¹⁸ = 161346397 is a prime.

It is a super-4 number, since 4×161608541⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161608498 and 161608507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161608571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80804270 + 80804271.

It is an arithmetic number, because the mean of its divisors is an integer number (80804271).

Almost surely, 2^161608541 is an apocalyptic number.

It is an amenable number.

161608541 is a deficient number, since it is larger than the sum of its proper divisors (1).

161608541 is an equidigital number, since it uses as much as digits as its factorization.

161608541 is an evil number, because the sum of its binary digits is even.

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

The square root of 161608541 is about 12712.5347983791. The cubic root of 161608541 is about 544.6967322108.

The spelling of 161608541 in words is "one hundred sixty-one million, six hundred eight thousand, five hundred forty-one".