72707191 has 2 divisors, whose sum is σ = 72707192. Its totient is φ = 72707190.

The previous prime is 72707189. The next prime is 72707213. The reversal of 72707191 is 19170727.

It is a weak prime.

It is an emirp because it is prime and its reverse (19170727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72707191 - 2¹ = 72707189 is a prime.

It is a super-2 number, since 2×72707191² = 10572671246220962, which contains 22 as substring.

Together with 72707189, 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 (72707101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36353595 + 36353596.

It is an arithmetic number, because the mean of its divisors is an integer number (36353596).

Almost surely, 2^72707191 is an apocalyptic number.

72707191 is a deficient number, since it is larger than the sum of its proper divisors (1).

72707191 is an equidigital number, since it uses as much as digits as its factorization.

72707191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 72707191 is about 8526.8511773104. The cubic root of 72707191 is about 417.3743817517.

The spelling of 72707191 in words is "seventy-two million, seven hundred seven thousand, one hundred ninety-one".