72789191 has 2 divisors, whose sum is σ = 72789192. Its totient is φ = 72789190.

The previous prime is 72789163. The next prime is 72789221. The reversal of 72789191 is 19198727.

It is a weak prime.

It is an emirp because it is prime and its reverse (19198727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72789191 - 2¹⁴ = 72772807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72789131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36394595 + 36394596.

It is an arithmetic number, because the mean of its divisors is an integer number (36394596).

Almost surely, 2^72789191 is an apocalyptic number.

72789191 is a deficient number, since it is larger than the sum of its proper divisors (1).

72789191 is an equidigital number, since it uses as much as digits as its factorization.

72789191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 72789191 is about 8531.6581623973. The cubic root of 72789191 is about 417.5312293324.

The spelling of 72789191 in words is "seventy-two million, seven hundred eighty-nine thousand, one hundred ninety-one".