161157789 has 32 divisors (see below), whose sum is σ = 261999360. Its totient is φ = 97291584.

The previous prime is 161157779. The next prime is 161157811. The reversal of 161157789 is 987751161.

161157789 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 161157789 - 2²³ = 152769181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161157719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14272 + ... + 22934.

It is an arithmetic number, because the mean of its divisors is an integer number (8187480).

Almost surely, 2^161157789 is an apocalyptic number.

It is an amenable number.

161157789 is a deficient number, since it is larger than the sum of its proper divisors (100841571).

161157789 is a wasteful number, since it uses less digits than its factorization.

161157789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8738 (or 8732 counting only the distinct ones).

The product of its digits is 105840, while the sum is 45.

The square root of 161157789 is about 12694.7937754026. The cubic root of 161157789 is about 544.1898452975.

The spelling of 161157789 in words is "one hundred sixty-one million, one hundred fifty-seven thousand, seven hundred eighty-nine".