2181795349 has 2 divisors, whose sum is σ = 2181795350. Its totient is φ = 2181795348.

The previous prime is 2181795331. The next prime is 2181795373. The reversal of 2181795349 is 9435971812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2152310449 + 29484900 = 46393^2 + 5430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181795349 - 2¹⁹ = 2181271061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181795149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090897674 + 1090897675.

It is an arithmetic number, because the mean of its divisors is an integer number (1090897675).

Almost surely, 2^2181795349 is an apocalyptic number.

It is an amenable number.

2181795349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181795349 is an equidigital number, since it uses as much as digits as its factorization.

2181795349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The square root of 2181795349 is about 46709.6922383353. The cubic root of 2181795349 is about 1296.9941100987.

The spelling of 2181795349 in words is "two billion, one hundred eighty-one million, seven hundred ninety-five thousand, three hundred forty-nine".