2159943917 has 2 divisors, whose sum is σ = 2159943918. Its totient is φ = 2159943916.

The previous prime is 2159943913. The next prime is 2159944021. The reversal of 2159943917 is 7193499512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1968785641 + 191158276 = 44371^2 + 13826^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159943917 - 2² = 2159943913 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159943913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079971958 + 1079971959.

It is an arithmetic number, because the mean of its divisors is an integer number (1079971959).

Almost surely, 2^2159943917 is an apocalyptic number.

It is an amenable number.

2159943917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159943917 is an equidigital number, since it uses as much as digits as its factorization.

2159943917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The square root of 2159943917 is about 46475.1967935586. The cubic root of 2159943917 is about 1292.6496262222.

The spelling of 2159943917 in words is "two billion, one hundred fifty-nine million, nine hundred forty-three thousand, nine hundred seventeen".