775650961 has 2 divisors, whose sum is σ = 775650962. Its totient is φ = 775650960.

The previous prime is 775650947. The next prime is 775650979. The reversal of 775650961 is 169056577.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726033025 + 49617936 = 26945^2 + 7044^2 .

It is an emirp because it is prime and its reverse (169056577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775650961 is a prime.

It is not a weakly prime, because it can be changed into another prime (775650991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387825480 + 387825481.

It is an arithmetic number, because the mean of its divisors is an integer number (387825481).

Almost surely, 2^775650961 is an apocalyptic number.

775650961 is the 16080-th hex number.

It is an amenable number.

775650961 is a deficient number, since it is larger than the sum of its proper divisors (1).

775650961 is an equidigital number, since it uses as much as digits as its factorization.

775650961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 46.

The square root of 775650961 is about 27850.5109647920. The cubic root of 775650961 is about 918.8023803045.

The spelling of 775650961 in words is "seven hundred seventy-five million, six hundred fifty thousand, nine hundred sixty-one".