634828421 has 2 divisors, whose sum is σ = 634828422. Its totient is φ = 634828420.

The previous prime is 634828409. The next prime is 634828459. The reversal of 634828421 is 124828436.

It is an a-pointer prime, because the next prime (634828459) can be obtained adding 634828421 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452200225 + 182628196 = 21265^2 + 13514^2 .

It is a cyclic number.

It is not a de Polignac number, because 634828421 - 2¹⁰ = 634827397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634828471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317414210 + 317414211.

It is an arithmetic number, because the mean of its divisors is an integer number (317414211).

Almost surely, 2^634828421 is an apocalyptic number.

It is an amenable number.

634828421 is a deficient number, since it is larger than the sum of its proper divisors (1).

634828421 is an equidigital number, since it uses as much as digits as its factorization.

634828421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 38.

The square root of 634828421 is about 25195.8016542439. The cubic root of 634828421 is about 859.4463811139.

The spelling of 634828421 in words is "six hundred thirty-four million, eight hundred twenty-eight thousand, four hundred twenty-one".