161989235 has 8 divisors (see below), whose sum is σ = 194549040. Its totient is φ = 129483424.

The previous prime is 161989199. The next prime is 161989249. The reversal of 161989235 is 532989161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161989235 - 2⁸ = 161988979 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6572 + ... + 19161.

It is an arithmetic number, because the mean of its divisors is an integer number (24318630).

Almost surely, 2^161989235 is an apocalyptic number.

161989235 is a deficient number, since it is larger than the sum of its proper divisors (32559805).

161989235 is a wasteful number, since it uses less digits than its factorization.

161989235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26997.

The product of its digits is 116640, while the sum is 44.

The square root of 161989235 is about 12727.4991651935. The cubic root of 161989235 is about 545.1241027037.

The spelling of 161989235 in words is "one hundred sixty-one million, nine hundred eighty-nine thousand, two hundred thirty-five".