634625671 has 2 divisors, whose sum is σ = 634625672. Its totient is φ = 634625670.

The previous prime is 634625659. The next prime is 634625681. The reversal of 634625671 is 176526436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634625671 - 2¹³ = 634617479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634625681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317312835 + 317312836.

It is an arithmetic number, because the mean of its divisors is an integer number (317312836).

Almost surely, 2^634625671 is an apocalyptic number.

634625671 is a deficient number, since it is larger than the sum of its proper divisors (1).

634625671 is an equidigital number, since it uses as much as digits as its factorization.

634625671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 634625671 is about 25191.7778451621. Note that the first 3 decimals coincide. The cubic root of 634625671 is about 859.3548753872.

The spelling of 634625671 in words is "six hundred thirty-four million, six hundred twenty-five thousand, six hundred seventy-one".