72006191 has 2 divisors, whose sum is σ = 72006192. Its totient is φ = 72006190.

The previous prime is 72006157. The next prime is 72006197. The reversal of 72006191 is 19160027.

It is a strong prime.

It is an emirp because it is prime and its reverse (19160027) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72006191 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72006191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72006197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36003095 + 36003096.

It is an arithmetic number, because the mean of its divisors is an integer number (36003096).

Almost surely, 2^72006191 is an apocalyptic number.

72006191 is a deficient number, since it is larger than the sum of its proper divisors (1).

72006191 is an equidigital number, since it uses as much as digits as its factorization.

72006191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 72006191 is about 8485.6461745703. The cubic root of 72006191 is about 416.0286881565.

The spelling of 72006191 in words is "seventy-two million, six thousand, one hundred ninety-one".