764556137 has 2 divisors, whose sum is σ = 764556138. Its totient is φ = 764556136.

The previous prime is 764556119. The next prime is 764556139. The reversal of 764556137 is 731655467.

764556137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416323216 + 348232921 = 20404^2 + 18661^2 .

It is an emirp because it is prime and its reverse (731655467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764556137 - 2⁶ = 764556073 is a prime.

Together with 764556139, 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 (764556139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382278068 + 382278069.

It is an arithmetic number, because the mean of its divisors is an integer number (382278069).

Almost surely, 2^764556137 is an apocalyptic number.

It is an amenable number.

764556137 is a deficient number, since it is larger than the sum of its proper divisors (1).

764556137 is an equidigital number, since it uses as much as digits as its factorization.

764556137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529200, while the sum is 44.

The square root of 764556137 is about 27650.6082573241. The cubic root of 764556137 is about 914.4005098965.

The spelling of 764556137 in words is "seven hundred sixty-four million, five hundred fifty-six thousand, one hundred thirty-seven".