8621561073 has 4 divisors (see below), whose sum is σ = 11495414768. Its totient is φ = 5747707380.

The previous prime is 8621561051. The next prime is 8621561077. The reversal of 8621561073 is 3701651268.

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.

It is not a de Polignac number, because 8621561073 - 2¹⁴ = 8621544689 is a prime.

It is a super-2 number, since 2×8621561073² (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 (8621561077) 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, 1436926843 + ... + 1436926848.

It is an arithmetic number, because the mean of its divisors is an integer number (2873853692).

Almost surely, 2^8621561073 is an apocalyptic number.

It is an amenable number.

8621561073 is a deficient number, since it is larger than the sum of its proper divisors (2873853695).

8621561073 is a wasteful number, since it uses less digits than its factorization.

8621561073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873853694.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 8621561073 is about 92852.3616985589. The cubic root of 8621561073 is about 2050.5103685060.

The spelling of 8621561073 in words is "eight billion, six hundred twenty-one million, five hundred sixty-one thousand, seventy-three".