65173989 has 4 divisors (see below), whose sum is σ = 86898656. Its totient is φ = 43449324.

The previous prime is 65173981. The next prime is 65174017. The reversal of 65173989 is 98937156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65173989 - 2³ = 65173981 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 (65173981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10862329 + ... + 10862334.

It is an arithmetic number, because the mean of its divisors is an integer number (21724664).

Almost surely, 2^65173989 is an apocalyptic number.

It is an amenable number.

65173989 is a deficient number, since it is larger than the sum of its proper divisors (21724667).

65173989 is a wasteful number, since it uses less digits than its factorization.

65173989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21724666.

The product of its digits is 408240, while the sum is 48.

The square root of 65173989 is about 8073.0408768939. The cubic root of 65173989 is about 402.4310060104.

The spelling of 65173989 in words is "sixty-five million, one hundred seventy-three thousand, nine hundred eighty-nine".