775749691 has 2 divisors, whose sum is σ = 775749692. Its totient is φ = 775749690.

The previous prime is 775749677. The next prime is 775749701. The reversal of 775749691 is 196947577.

It is a strong prime.

It is an emirp because it is prime and its reverse (196947577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775749691 - 2⁷ = 775749563 is a prime.

It is not a weakly prime, because it can be changed into another prime (775749631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387874845 + 387874846.

It is an arithmetic number, because the mean of its divisors is an integer number (387874846).

Almost surely, 2^775749691 is an apocalyptic number.

775749691 is a deficient number, since it is larger than the sum of its proper divisors (1).

775749691 is an equidigital number, since it uses as much as digits as its factorization.

775749691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 55.

The square root of 775749691 is about 27852.2834072900. The cubic root of 775749691 is about 918.8413624047.

The spelling of 775749691 in words is "seven hundred seventy-five million, seven hundred forty-nine thousand, six hundred ninety-one".