634920647 has 2 divisors, whose sum is σ = 634920648. Its totient is φ = 634920646.

The previous prime is 634920631. The next prime is 634920659. The reversal of 634920647 is 746029436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634920647 - 2⁴ = 634920631 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634925647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317460323 + 317460324.

It is an arithmetic number, because the mean of its divisors is an integer number (317460324).

Almost surely, 2^634920647 is an apocalyptic number.

634920647 is a deficient number, since it is larger than the sum of its proper divisors (1).

634920647 is an equidigital number, since it uses as much as digits as its factorization.

634920647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 634920647 is about 25197.6317736410. The cubic root of 634920647 is about 859.4879983768.

The spelling of 634920647 in words is "six hundred thirty-four million, nine hundred twenty thousand, six hundred forty-seven".