8538587261 has 2 divisors, whose sum is σ = 8538587262. Its totient is φ = 8538587260.

The previous prime is 8538587249. The next prime is 8538587293. The reversal of 8538587261 is 1627858358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7535281636 + 1003305625 = 86806^2 + 31675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8538587261 is a prime.

It is a super-2 number, since 2×8538587261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8538587221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4269293630 + 4269293631.

It is an arithmetic number, because the mean of its divisors is an integer number (4269293631).

Almost surely, 2^8538587261 is an apocalyptic number.

It is an amenable number.

8538587261 is a deficient number, since it is larger than the sum of its proper divisors (1).

8538587261 is an equidigital number, since it uses as much as digits as its factorization.

8538587261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 53.

The square root of 8538587261 is about 92404.4764121306. The cubic root of 8538587261 is about 2043.9111226662.

The spelling of 8538587261 in words is "eight billion, five hundred thirty-eight million, five hundred eighty-seven thousand, two hundred sixty-one".