161049989 has 2 divisors, whose sum is σ = 161049990. Its totient is φ = 161049988.

The previous prime is 161049983. The next prime is 161050013. The reversal of 161049989 is 989940161.

161049989 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., 146289025 + 14760964 = 12095^2 + 3842^2 .

It is a cyclic number.

It is not a de Polignac number, because 161049989 - 2²⁴ = 144272773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161049983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80524994 + 80524995.

It is an arithmetic number, because the mean of its divisors is an integer number (80524995).

Almost surely, 2^161049989 is an apocalyptic number.

It is an amenable number.

161049989 is a deficient number, since it is larger than the sum of its proper divisors (1).

161049989 is an equidigital number, since it uses as much as digits as its factorization.

161049989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 161049989 is about 12690.5472301237. The cubic root of 161049989 is about 544.0684802867.

The spelling of 161049989 in words is "one hundred sixty-one million, forty-nine thousand, nine hundred eighty-nine".