634281289 has 2 divisors, whose sum is σ = 634281290. Its totient is φ = 634281288.

The previous prime is 634281259. The next prime is 634281299. The reversal of 634281289 is 982182436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599270400 + 35010889 = 24480^2 + 5917^2 .

It is a cyclic number.

It is not a de Polignac number, because 634281289 - 2²³ = 625892681 is a prime.

It is not a weakly prime, because it can be changed into another prime (634281209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317140644 + 317140645.

It is an arithmetic number, because the mean of its divisors is an integer number (317140645).

Almost surely, 2^634281289 is an apocalyptic number.

It is an amenable number.

634281289 is a deficient number, since it is larger than the sum of its proper divisors (1).

634281289 is an equidigital number, since it uses as much as digits as its factorization.

634281289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 634281289 is about 25184.9417112687. The cubic root of 634281289 is about 859.1994032129.

The spelling of 634281289 in words is "six hundred thirty-four million, two hundred eighty-one thousand, two hundred eighty-nine".