8917649641 has 4 divisors (see below), whose sum is σ = 8972359312. Its totient is φ = 8862939972.

The previous prime is 8917649623. The next prime is 8917649647. The reversal of 8917649641 is 1469467198.

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: 1469467198 = 2 ⋅734733599.

It is a cyclic number.

It is not a de Polignac number, because 8917649641 - 2¹³ = 8917641449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8917649647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27354591 + ... + 27354916.

It is an arithmetic number, because the mean of its divisors is an integer number (2243089828).

Almost surely, 2^8917649641 is an apocalyptic number.

It is an amenable number.

8917649641 is a deficient number, since it is larger than the sum of its proper divisors (54709671).

8917649641 is a wasteful number, since it uses less digits than its factorization.

8917649641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54709670.

The product of its digits is 2612736, while the sum is 55.

The square root of 8917649641 is about 94433.3079003378. The cubic root of 8917649641 is about 2073.7200906180.

The spelling of 8917649641 in words is "eight billion, nine hundred seventeen million, six hundred forty-nine thousand, six hundred forty-one".