635493681 has 15 divisors (see below), whose sum is σ = 949656763. Its totient is φ = 423511200.

The previous prime is 635493679. The next prime is 635493697. The reversal of 635493681 is 186394536.

The square root of 635493681 is 25209.

It is a perfect power (a square), and thus also a powerful number.

635493681 is a `hidden beast` number, since 635 + 4 + 9 + 3 + 6 + 8 + 1 = 666.

635493681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 324324081 + 311169600 = 18009^2 + 17640^2 .

It is not a de Polignac number, because 635493681 - 2¹ = 635493679 is a prime.

It is a super-2 number, since 2×635493681² = 807704437181859522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (635493601) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 225481 + ... + 228281.

Almost surely, 2^635493681 is an apocalyptic number.

635493681 is the 25209-th square number.

635493681 is the 12605-th centered octagonal number.

It is an amenable number.

635493681 is a deficient number, since it is larger than the sum of its proper divisors (314163082).

635493681 is an frugal number, since it uses more digits than its factorization.

635493681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5614 (or 2804 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The cubic root of 635493681 is about 859.7464914406.

The spelling of 635493681 in words is "six hundred thirty-five million, four hundred ninety-three thousand, six hundred eighty-one".