2981721361 has 4 divisors (see below), whose sum is σ = 2982375424. Its totient is φ = 2981067300.

The previous prime is 2981721317. The next prime is 2981721371. The reversal of 2981721361 is 1631271892.

2981721361 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 not a de Polignac number, because 2981721361 - 2⁹ = 2981720849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2981721371) 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, 320145 + ... + 329326.

It is an arithmetic number, because the mean of its divisors is an integer number (745593856).

Almost surely, 2^2981721361 is an apocalyptic number.

It is an amenable number.

2981721361 is a deficient number, since it is larger than the sum of its proper divisors (654063).

2981721361 is an equidigital number, since it uses as much as digits as its factorization.

2981721361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654062.

The product of its digits is 36288, while the sum is 40.

The square root of 2981721361 is about 54605.1404265203. The cubic root of 2981721361 is about 1439.3144500730.

The spelling of 2981721361 in words is "two billion, nine hundred eighty-one million, seven hundred twenty-one thousand, three hundred sixty-one".