161518349 has 2 divisors, whose sum is σ = 161518350. Its totient is φ = 161518348.

The previous prime is 161518261. The next prime is 161518361. The reversal of 161518349 is 943815161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156700324 + 4818025 = 12518^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 161518349 - 2¹⁶ = 161452813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161518849) 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, 80759174 + 80759175.

It is an arithmetic number, because the mean of its divisors is an integer number (80759175).

Almost surely, 2^161518349 is an apocalyptic number.

It is an amenable number.

161518349 is a deficient number, since it is larger than the sum of its proper divisors (1).

161518349 is an equidigital number, since it uses as much as digits as its factorization.

161518349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 161518349 is about 12708.9869383834. The cubic root of 161518349 is about 544.5953835458.

The spelling of 161518349 in words is "one hundred sixty-one million, five hundred eighteen thousand, three hundred forty-nine".