764550091 has 2 divisors, whose sum is σ = 764550092. Its totient is φ = 764550090.

The previous prime is 764550047. The next prime is 764550121. The reversal of 764550091 is 190055467.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 764550091 - 2¹⁵ = 764517323 is a 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 764550091.

It is not a weakly prime, because it can be changed into another prime (764550011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382275045 + 382275046.

It is an arithmetic number, because the mean of its divisors is an integer number (382275046).

Almost surely, 2^764550091 is an apocalyptic number.

764550091 is a deficient number, since it is larger than the sum of its proper divisors (1).

764550091 is an equidigital number, since it uses as much as digits as its factorization.

764550091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 764550091 is about 27650.4989285908. The cubic root of 764550091 is about 914.3980995742.

The spelling of 764550091 in words is "seven hundred sixty-four million, five hundred fifty thousand, ninety-one".