2181630353 has 4 divisors (see below), whose sum is σ = 2493291840. Its totient is φ = 1869968868.

The previous prime is 2181630323. The next prime is 2181630359. The reversal of 2181630353 is 3530361812.

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 not a de Polignac number, because 2181630353 - 2⁶ = 2181630289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181630359) 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, 155830733 + ... + 155830746.

It is an arithmetic number, because the mean of its divisors is an integer number (623322960).

Almost surely, 2^2181630353 is an apocalyptic number.

It is an amenable number.

2181630353 is a deficient number, since it is larger than the sum of its proper divisors (311661487).

2181630353 is an equidigital number, since it uses as much as digits as its factorization.

2181630353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311661486.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 2181630353 is about 46707.9260190388. The cubic root of 2181630353 is about 1296.9614146651.

The spelling of 2181630353 in words is "two billion, one hundred eighty-one million, six hundred thirty thousand, three hundred fifty-three".