3630647921 has 4 divisors (see below), whose sum is σ = 3631051632. Its totient is φ = 3630244212.

The previous prime is 3630647897. The next prime is 3630647929. The reversal of 3630647921 is 1297460363.

3630647921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3630647921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3630647929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188051 + ... + 206456.

It is an arithmetic number, because the mean of its divisors is an integer number (907762908).

Almost surely, 2^3630647921 is an apocalyptic number.

It is an amenable number.

3630647921 is a deficient number, since it is larger than the sum of its proper divisors (403711).

3630647921 is an equidigital number, since it uses as much as digits as its factorization.

3630647921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403710.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 3630647921 is about 60254.8580697026. The cubic root of 3630647921 is about 1536.9558012871.

The spelling of 3630647921 in words is "three billion, six hundred thirty million, six hundred forty-seven thousand, nine hundred twenty-one".