921619000091 has 4 divisors (see below), whose sum is σ = 922367676384. Its totient is φ = 920870323800.

The previous prime is 921619000063. The next prime is 921619000157. The reversal of 921619000091 is 190000916129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921619000091 - 2¹⁴ = 921618983707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921619000391) 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, 374336300 + ... + 374338761.

It is an arithmetic number, because the mean of its divisors is an integer number (230591919096).

Almost surely, 2^921619000091 is an apocalyptic number.

921619000091 is a deficient number, since it is larger than the sum of its proper divisors (748676293).

921619000091 is a wasteful number, since it uses less digits than its factorization.

921619000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748676292.

The product of its (nonzero) digits is 8748, while the sum is 38.

The spelling of 921619000091 in words is "nine hundred twenty-one billion, six hundred nineteen million, ninety-one", and thus it is an aban number.