2113565989 has 2 divisors, whose sum is σ = 2113565990. Its totient is φ = 2113565988.

The previous prime is 2113565981. The next prime is 2113566017. The reversal of 2113565989 is 9895653112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1564835364 + 548730625 = 39558^2 + 23425^2 .

It is a cyclic number.

It is not a de Polignac number, because 2113565989 - 2³ = 2113565981 is a prime.

It is a super-2 number, since 2×2113565989² = 8934322379715096242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2113565981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056782994 + 1056782995.

It is an arithmetic number, because the mean of its divisors is an integer number (1056782995).

Almost surely, 2^2113565989 is an apocalyptic number.

It is an amenable number.

2113565989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2113565989 is an equidigital number, since it uses as much as digits as its factorization.

2113565989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 49.

The square root of 2113565989 is about 45973.5357461225. The cubic root of 2113565989 is about 1283.3307599356.

The spelling of 2113565989 in words is "two billion, one hundred thirteen million, five hundred sixty-five thousand, nine hundred eighty-nine".