161336449 has 2 divisors, whose sum is σ = 161336450. Its totient is φ = 161336448.

The previous prime is 161336447. The next prime is 161336453. The reversal of 161336449 is 944633161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104182849 + 57153600 = 10207^2 + 7560^2 .

It is a cyclic number.

It is not a de Polignac number, because 161336449 - 2¹ = 161336447 is a prime.

Together with 161336447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161336447) 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, 80668224 + 80668225.

It is an arithmetic number, because the mean of its divisors is an integer number (80668225).

Almost surely, 2^161336449 is an apocalyptic number.

It is an amenable number.

161336449 is a deficient number, since it is larger than the sum of its proper divisors (1).

161336449 is an equidigital number, since it uses as much as digits as its factorization.

161336449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 161336449 is about 12701.8285691470. The cubic root of 161336449 is about 544.3908678533.

It can be divided in two parts, 161 and 336449, that added together give a triangular number (336610 = T₈₂₀).

The spelling of 161336449 in words is "one hundred sixty-one million, three hundred thirty-six thousand, four hundred forty-nine".