79531189 has 2 divisors, whose sum is σ = 79531190. Its totient is φ = 79531188.

The previous prime is 79531187. The next prime is 79531223. The reversal of 79531189 is 98113597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 8803089 = 8410^2 + 2967^2 .

It is a cyclic number.

It is not a de Polignac number, because 79531189 - 2¹ = 79531187 is a prime.

Together with 79531187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79531187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39765594 + 39765595.

It is an arithmetic number, because the mean of its divisors is an integer number (39765595).

Almost surely, 2^79531189 is an apocalyptic number.

It is an amenable number.

79531189 is a deficient number, since it is larger than the sum of its proper divisors (1).

79531189 is an equidigital number, since it uses as much as digits as its factorization.

79531189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 79531189 is about 8918.0260708298. The cubic root of 79531189 is about 430.0436029337.

The spelling of 79531189 in words is "seventy-nine million, five hundred thirty-one thousand, one hundred eighty-nine".