634842539 has 2 divisors, whose sum is σ = 634842540. Its totient is φ = 634842538.

The previous prime is 634842493. The next prime is 634842541. The reversal of 634842539 is 935248436.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634842539 is a prime.

Together with 634842541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634842539.

It is not a weakly prime, because it can be changed into another prime (634842599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317421269 + 317421270.

It is an arithmetic number, because the mean of its divisors is an integer number (317421270).

Almost surely, 2^634842539 is an apocalyptic number.

634842539 is a deficient number, since it is larger than the sum of its proper divisors (1).

634842539 is an equidigital number, since it uses as much as digits as its factorization.

634842539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 44.

The square root of 634842539 is about 25196.0818184098. The cubic root of 634842539 is about 859.4527521656.

The spelling of 634842539 in words is "six hundred thirty-four million, eight hundred forty-two thousand, five hundred thirty-nine".