8535508621 has 4 divisors (see below), whose sum is σ = 8536079644. Its totient is φ = 8534937600.

The previous prime is 8535508589. The next prime is 8535508637. The reversal of 8535508621 is 1268055358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1268055358 = 2 ⋅634027679.

It can be written as a sum of positive squares in 2 ways, for example, as 5341563396 + 3193945225 = 73086^2 + 56515^2 .

It is a cyclic number.

It is not a de Polignac number, because 8535508621 - 2⁵ = 8535508589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8535508691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262470 + ... + 293191.

It is an arithmetic number, because the mean of its divisors is an integer number (2134019911).

Almost surely, 2^8535508621 is an apocalyptic number.

It is an amenable number.

8535508621 is a deficient number, since it is larger than the sum of its proper divisors (571023).

8535508621 is a wasteful number, since it uses less digits than its factorization.

8535508621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571022.

The product of its (nonzero) digits is 288000, while the sum is 43.

The square root of 8535508621 is about 92387.8164099574. The cubic root of 8535508621 is about 2043.6654449071.

The spelling of 8535508621 in words is "eight billion, five hundred thirty-five million, five hundred eight thousand, six hundred twenty-one".