5261009989 has 2 divisors, whose sum is σ = 5261009990. Its totient is φ = 5261009988.

The previous prime is 5261009987. The next prime is 5261009993. The reversal of 5261009989 is 9899001625.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5255525025 + 5484964 = 72495^2 + 2342^2 .

It is a cyclic number.

It is not a de Polignac number, because 5261009989 - 2¹ = 5261009987 is a prime.

It is a super-2 number, since 2×5261009989² = 55356452208715560242, which contains 22 as substring.

Together with 5261009987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5261009987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2630504994 + 2630504995.

It is an arithmetic number, because the mean of its divisors is an integer number (2630504995).

Almost surely, 2^5261009989 is an apocalyptic number.

It is an amenable number.

5261009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

5261009989 is an equidigital number, since it uses as much as digits as its factorization.

5261009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 5261009989 is about 72532.8200816706. The cubic root of 5261009989 is about 1739.2274269834.

The spelling of 5261009989 in words is "five billion, two hundred sixty-one million, nine thousand, nine hundred eighty-nine".