76721191 has 2 divisors, whose sum is σ = 76721192. Its totient is φ = 76721190.

The previous prime is 76721179. The next prime is 76721207. The reversal of 76721191 is 19112767.

It is a weak prime.

It is an emirp because it is prime and its reverse (19112767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76721191 - 2²⁵ = 43166759 is a prime.

It is a super-2 number, since 2×76721191² = 11772282296916962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76721101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38360595 + 38360596.

It is an arithmetic number, because the mean of its divisors is an integer number (38360596).

Almost surely, 2^76721191 is an apocalyptic number.

76721191 is a deficient number, since it is larger than the sum of its proper divisors (1).

76721191 is an equidigital number, since it uses as much as digits as its factorization.

76721191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 34.

The square root of 76721191 is about 8759.0633631685. The cubic root of 76721191 is about 424.9179837122.

The spelling of 76721191 in words is "seventy-six million, seven hundred twenty-one thousand, one hundred ninety-one".