768631261 has 2 divisors, whose sum is σ = 768631262. Its totient is φ = 768631260.

The previous prime is 768631207. The next prime is 768631363. The reversal of 768631261 is 162136867.

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., 752679225 + 15952036 = 27435^2 + 3994^2 .

It is a cyclic number.

It is not a de Polignac number, because 768631261 - 2⁷ = 768631133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (768631861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384315630 + 384315631.

It is an arithmetic number, because the mean of its divisors is an integer number (384315631).

Almost surely, 2^768631261 is an apocalyptic number.

It is an amenable number.

768631261 is a deficient number, since it is larger than the sum of its proper divisors (1).

768631261 is an equidigital number, since it uses as much as digits as its factorization.

768631261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 768631261 is about 27724.1999163186. The cubic root of 768631261 is about 916.0222327797.

The spelling of 768631261 in words is "seven hundred sixty-eight million, six hundred thirty-one thousand, two hundred sixty-one".