161385541 has 2 divisors, whose sum is σ = 161385542. Its totient is φ = 161385540.

The previous prime is 161385529. The next prime is 161385547. The reversal of 161385541 is 145583161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 61685316 = 9985^2 + 7854^2 .

It is a cyclic number.

It is not a de Polignac number, because 161385541 - 2¹¹ = 161383493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161385497 and 161385506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161385547) 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, 80692770 + 80692771.

It is an arithmetic number, because the mean of its divisors is an integer number (80692771).

Almost surely, 2^161385541 is an apocalyptic number.

It is an amenable number.

161385541 is a deficient number, since it is larger than the sum of its proper divisors (1).

161385541 is an equidigital number, since it uses as much as digits as its factorization.

161385541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 34.

The square root of 161385541 is about 12703.7608998281. The cubic root of 161385541 is about 544.4460786182.

The spelling of 161385541 in words is "one hundred sixty-one million, three hundred eighty-five thousand, five hundred forty-one".