634021543 has 2 divisors, whose sum is σ = 634021544. Its totient is φ = 634021542.

The previous prime is 634021471. The next prime is 634021567. The reversal of 634021543 is 345120436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634021543 - 2²⁵ = 600467111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634021343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317010771 + 317010772.

It is an arithmetic number, because the mean of its divisors is an integer number (317010772).

Almost surely, 2^634021543 is an apocalyptic number.

634021543 is a deficient number, since it is larger than the sum of its proper divisors (1).

634021543 is an equidigital number, since it uses as much as digits as its factorization.

634021543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 634021543 is about 25179.7844113090. The cubic root of 634021543 is about 859.0821029534.

Adding to 634021543 its reverse (345120436), we get a palindrome (979141979).

The spelling of 634021543 in words is "six hundred thirty-four million, twenty-one thousand, five hundred forty-three".