161499941 has 2 divisors, whose sum is σ = 161499942. Its totient is φ = 161499940.

The previous prime is 161499913. The next prime is 161499979. The reversal of 161499941 is 149994161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83795716 + 77704225 = 9154^2 + 8815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161499941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161499892 and 161499901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161499901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80749970 + 80749971.

It is an arithmetic number, because the mean of its divisors is an integer number (80749971).

Almost surely, 2^161499941 is an apocalyptic number.

It is an amenable number.

161499941 is a deficient number, since it is larger than the sum of its proper divisors (1).

161499941 is an equidigital number, since it uses as much as digits as its factorization.

161499941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 161499941 is about 12708.2627058147. The cubic root of 161499941 is about 544.5746938579.

The spelling of 161499941 in words is "one hundred sixty-one million, four hundred ninety-nine thousand, nine hundred forty-one".