630453861 has 20 divisors (see below), whose sum is σ = 948680172. Its totient is φ = 417227328.

The previous prime is 630453829. The next prime is 630453883. The reversal of 630453861 is 168354036.

630453861 is a `hidden beast` number, since 63 + 0 + 4 + 538 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 533332836 + 97121025 = 23094^2 + 9855^2 .

It is not a de Polignac number, because 630453861 - 2⁵ = 630453829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630454861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17310 + ... + 39503.

Almost surely, 2^630453861 is an apocalyptic number.

It is an amenable number.

630453861 is a deficient number, since it is larger than the sum of its proper divisors (318226311).

630453861 is a wasteful number, since it uses less digits than its factorization.

630453861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56962 (or 56953 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 630453861 is about 25108.8402958002. The cubic root of 630453861 is about 857.4677000530.

The spelling of 630453861 in words is "six hundred thirty million, four hundred fifty-three thousand, eight hundred sixty-one".