2447159921 has 2 divisors, whose sum is σ = 2447159922. Its totient is φ = 2447159920.

The previous prime is 2447159917. The next prime is 2447159927. The reversal of 2447159921 is 1299517442.

2447159921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1360798321 + 1086361600 = 36889^2 + 32960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2447159921 - 2² = 2447159917 is a prime.

It is not a weakly prime, because it can be changed into another prime (2447159927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1223579960 + 1223579961.

It is an arithmetic number, because the mean of its divisors is an integer number (1223579961).

Almost surely, 2^2447159921 is an apocalyptic number.

It is an amenable number.

2447159921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2447159921 is an equidigital number, since it uses as much as digits as its factorization.

2447159921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 2447159921 is about 49468.7772337259. Note that the first 3 decimals coincide. The cubic root of 2447159921 is about 1347.5786355782.

The spelling of 2447159921 in words is "two billion, four hundred forty-seven million, one hundred fifty-nine thousand, nine hundred twenty-one".