161325989 has 8 divisors (see below), whose sum is σ = 176083968. Its totient is φ = 146583360.

The previous prime is 161325977. The next prime is 161325991. The reversal of 161325989 is 989523161.

It is a happy number.

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

It is not a de Polignac number, because 161325989 - 2⁴ = 161325973 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 (161325929) 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, 38684 + ... + 42650.

It is an arithmetic number, because the mean of its divisors is an integer number (22010496).

Almost surely, 2^161325989 is an apocalyptic number.

It is an amenable number.

161325989 is a deficient number, since it is larger than the sum of its proper divisors (14757979).

161325989 is a wasteful number, since it uses less digits than its factorization.

161325989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7675.

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

The square root of 161325989 is about 12701.4168107341. The cubic root of 161325989 is about 544.3791026848.

The spelling of 161325989 in words is "one hundred sixty-one million, three hundred twenty-five thousand, nine hundred eighty-nine".