79145989 has 4 divisors (see below), whose sum is σ = 85234156. Its totient is φ = 73057824.

The previous prime is 79145981. The next prime is 79146029. The reversal of 79145989 is 98954197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98954197 = 41 ⋅2413517.

It can be written as a sum of positive squares in 2 ways, for example, as 12723489 + 66422500 = 3567^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 79145989 - 2³ = 79145981 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 (79145981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3044064 + ... + 3044089.

It is an arithmetic number, because the mean of its divisors is an integer number (21308539).

Almost surely, 2^79145989 is an apocalyptic number.

It is an amenable number.

79145989 is a deficient number, since it is larger than the sum of its proper divisors (6088167).

79145989 is a wasteful number, since it uses less digits than its factorization.

79145989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6088166.

The product of its digits is 816480, while the sum is 52.

The square root of 79145989 is about 8896.4031495880. The cubic root of 79145989 is about 429.3481903966.

The spelling of 79145989 in words is "seventy-nine million, one hundred forty-five thousand, nine hundred eighty-nine".