8505645121 has 4 divisors (see below), whose sum is σ = 8520541744. Its totient is φ = 8490748500.

The previous prime is 8505645107. The next prime is 8505645133. The reversal of 8505645121 is 1215465058.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1215465058 = 2 ⋅607732529.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8505645121 is a prime.

It is a super-2 number, since 2×8505645121² (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 (8505645221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7447455 + ... + 7448596.

It is an arithmetic number, because the mean of its divisors is an integer number (2130135436).

Almost surely, 2^8505645121 is an apocalyptic number.

It is an amenable number.

8505645121 is a deficient number, since it is larger than the sum of its proper divisors (14896623).

8505645121 is a wasteful number, since it uses less digits than its factorization.

8505645121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14896622.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 8505645121 is about 92226.0544585965. The cubic root of 8505645121 is about 2041.2792438599.

The spelling of 8505645121 in words is "eight billion, five hundred five million, six hundred forty-five thousand, one hundred twenty-one".