161231061449 has 2 divisors, whose sum is σ = 161231061450. Its totient is φ = 161231061448.

The previous prime is 161231061437. The next prime is 161231061457. The reversal of 161231061449 is 944160132161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160906881424 + 324180025 = 401132^2 + 18005^2 .

It is a cyclic number.

It is not a de Polignac number, because 161231061449 - 2²⁰ = 161230012873 is a prime.

It is not a weakly prime, because it can be changed into another prime (161231061419) 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, 80615530724 + 80615530725.

It is an arithmetic number, because the mean of its divisors is an integer number (80615530725).

Almost surely, 2^161231061449 is an apocalyptic number.

It is an amenable number.

161231061449 is a deficient number, since it is larger than the sum of its proper divisors (1).

161231061449 is an equidigital number, since it uses as much as digits as its factorization.

161231061449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 161231061449 in words is "one hundred sixty-one billion, two hundred thirty-one million, sixty-one thousand, four hundred forty-nine".