9921911617 has 8 divisors (see below), whose sum is σ = 10130814720. Its totient is φ = 9715173600.

The previous prime is 9921911609. The next prime is 9921911621. The reversal of 9921911617 is 7161191299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9921911617 - 2³ = 9921911609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9921911627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532009 + ... + 550342.

It is an arithmetic number, because the mean of its divisors is an integer number (1266351840).

Almost surely, 2^9921911617 is an apocalyptic number.

It is an amenable number.

9921911617 is a deficient number, since it is larger than the sum of its proper divisors (208903103).

9921911617 is a wasteful number, since it uses less digits than its factorization.

9921911617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082543.

The product of its digits is 61236, while the sum is 46.

The square root of 9921911617 is about 99608.7928699068. The cubic root of 9921911617 is about 2148.8121519983.

The spelling of 9921911617 in words is "nine billion, nine hundred twenty-one million, nine hundred eleven thousand, six hundred seventeen".