161900449 has 2 divisors, whose sum is σ = 161900450. Its totient is φ = 161900448.

The previous prime is 161900393. The next prime is 161900509. The reversal of 161900449 is 944009161.

161900449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113806224 + 48094225 = 10668^2 + 6935^2 .

It is a cyclic number.

It is not a de Polignac number, because 161900449 - 2¹³ = 161892257 is a prime.

It is not a weakly prime, because it can be changed into another prime (161930449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80950224 + 80950225.

It is an arithmetic number, because the mean of its divisors is an integer number (80950225).

Almost surely, 2^161900449 is an apocalyptic number.

It is an amenable number.

161900449 is a deficient number, since it is larger than the sum of its proper divisors (1).

161900449 is an equidigital number, since it uses as much as digits as its factorization.

161900449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 161900449 is about 12724.0107277540. The cubic root of 161900449 is about 545.0244906650.

The spelling of 161900449 in words is "one hundred sixty-one million, nine hundred thousand, four hundred forty-nine".