20190928191091 has 16 divisors (see below), whose sum is σ = 23195476288000. Its totient is φ = 17216443842048.

The previous prime is 20190928191061. The next prime is 20190928191103. The reversal of 20190928191091 is 19019182909102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20190928191091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20190928191061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6456256 + ... + 9058978.

It is an arithmetic number, because the mean of its divisors is an integer number (1449717268000).

Almost surely, 2^{20190928191091} is an apocalyptic number.

20190928191091 is a deficient number, since it is larger than the sum of its proper divisors (3004548096909).

20190928191091 is a wasteful number, since it uses less digits than its factorization.

20190928191091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608498.

The product of its (nonzero) digits is 209952, while the sum is 52.

The spelling of 20190928191091 in words is "twenty trillion, one hundred ninety billion, nine hundred twenty-eight million, one hundred ninety-one thousand, ninety-one".