76821191 has 2 divisors, whose sum is σ = 76821192. Its totient is φ = 76821190.

The previous prime is 76821149. The next prime is 76821197. The reversal of 76821191 is 19112867.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76821191 - 2²² = 72626887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76821197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38410595 + 38410596.

It is an arithmetic number, because the mean of its divisors is an integer number (38410596).

Almost surely, 2^76821191 is an apocalyptic number.

76821191 is a deficient number, since it is larger than the sum of its proper divisors (1).

76821191 is an equidigital number, since it uses as much as digits as its factorization.

76821191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 76821191 is about 8764.7698771845. The cubic root of 76821191 is about 425.1025192128.

The spelling of 76821191 in words is "seventy-six million, eight hundred twenty-one thousand, one hundred ninety-one".