161902989 has 8 divisors (see below), whose sum is σ = 239856320. Its totient is φ = 107935308.

The previous prime is 161902981. The next prime is 161902999. The reversal of 161902989 is 989209161.

161902989 is a `hidden beast` number, since 1 + 619 + 0 + 29 + 8 + 9 = 666.

161902989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161902989 - 2³ = 161902981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161902981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2998177 + ... + 2998230.

It is an arithmetic number, because the mean of its divisors is an integer number (29982040).

Almost surely, 2^161902989 is an apocalyptic number.

It is an amenable number.

161902989 is a deficient number, since it is larger than the sum of its proper divisors (77953331).

161902989 is an equidigital number, since it uses as much as digits as its factorization.

161902989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5996416 (or 5996410 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 161902989 is about 12724.1105386585. The cubic root of 161902989 is about 545.0273408835.

The spelling of 161902989 in words is "one hundred sixty-one million, nine hundred two thousand, nine hundred eighty-nine".