764321791 has 2 divisors, whose sum is σ = 764321792. Its totient is φ = 764321790.

The previous prime is 764321749. The next prime is 764321801. The reversal of 764321791 is 197123467.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 764321791 - 2⁹ = 764321279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764321891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382160895 + 382160896.

It is an arithmetic number, because the mean of its divisors is an integer number (382160896).

Almost surely, 2^764321791 is an apocalyptic number.

764321791 is a deficient number, since it is larger than the sum of its proper divisors (1).

764321791 is an equidigital number, since it uses as much as digits as its factorization.

764321791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 764321791 is about 27646.3703042551. The cubic root of 764321791 is about 914.3070752926.

The spelling of 764321791 in words is "seven hundred sixty-four million, three hundred twenty-one thousand, seven hundred ninety-one".