161216149 has 2 divisors, whose sum is σ = 161216150. Its totient is φ = 161216148.

The previous prime is 161216119. The next prime is 161216173. The reversal of 161216149 is 941612161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159213924 + 2002225 = 12618^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 161216149 - 2¹¹ = 161214101 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 161216149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161216119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80608074 + 80608075.

It is an arithmetic number, because the mean of its divisors is an integer number (80608075).

Almost surely, 2^161216149 is an apocalyptic number.

It is an amenable number.

161216149 is a deficient number, since it is larger than the sum of its proper divisors (1).

161216149 is an equidigital number, since it uses as much as digits as its factorization.

161216149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 161216149 is about 12697.0921474171. The cubic root of 161216149 is about 544.2555264470.

The spelling of 161216149 in words is "one hundred sixty-one million, two hundred sixteen thousand, one hundred forty-nine".