8521240489 has 4 divisors (see below), whose sum is σ = 8751544324. Its totient is φ = 8290936656.

The previous prime is 8521240471. The next prime is 8521240501. The reversal of 8521240489 is 9840421258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6052840000 + 2468400489 = 77800^2 + 49683^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521240489 - 2¹¹ = 8521238441 is a prime.

It is a super-2 number, since 2×8521240489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8521240439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115151862 + ... + 115151935.

It is an arithmetic number, because the mean of its divisors is an integer number (2187886081).

Almost surely, 2^8521240489 is an apocalyptic number.

It is an amenable number.

8521240489 is a deficient number, since it is larger than the sum of its proper divisors (230303835).

8521240489 is a wasteful number, since it uses less digits than its factorization.

8521240489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230303834.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 8521240489 is about 92310.5654245493. The cubic root of 8521240489 is about 2042.5260653853.

The spelling of 8521240489 in words is "eight billion, five hundred twenty-one million, two hundred forty thousand, four hundred eighty-nine".