2159413981 has 2 divisors, whose sum is σ = 2159413982. Its totient is φ = 2159413980.

The previous prime is 2159413961. The next prime is 2159414029. The reversal of 2159413981 is 1893149512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2091598756 + 67815225 = 45734^2 + 8235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2159413981 - 2³¹ = 11930333 is a prime.

It is a super-2 number, since 2×2159413981² = 9326137482676536722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159413901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079706990 + 1079706991.

It is an arithmetic number, because the mean of its divisors is an integer number (1079706991).

Almost surely, 2^2159413981 is an apocalyptic number.

It is an amenable number.

2159413981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159413981 is an equidigital number, since it uses as much as digits as its factorization.

2159413981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 43.

The square root of 2159413981 is about 46469.4951661840. The cubic root of 2159413981 is about 1292.5439016249.

The spelling of 2159413981 in words is "two billion, one hundred fifty-nine million, four hundred thirteen thousand, nine hundred eighty-one".