766439129 has 2 divisors, whose sum is σ = 766439130. Its totient is φ = 766439128.

The previous prime is 766439123. The next prime is 766439131. The reversal of 766439129 is 921934667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630763225 + 135675904 = 25115^2 + 11648^2 .

It is a cyclic number.

It is not a de Polignac number, because 766439129 - 2⁸ = 766438873 is a prime.

Together with 766439131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (766439123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383219564 + 383219565.

It is an arithmetic number, because the mean of its divisors is an integer number (383219565).

Almost surely, 2^766439129 is an apocalyptic number.

It is an amenable number.

766439129 is a deficient number, since it is larger than the sum of its proper divisors (1).

766439129 is an equidigital number, since it uses as much as digits as its factorization.

766439129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 766439129 is about 27684.6370574006. The cubic root of 766439129 is about 915.1505735260.

The spelling of 766439129 in words is "seven hundred sixty-six million, four hundred thirty-nine thousand, one hundred twenty-nine".