9019920811 has 4 divisors (see below), whose sum is σ = 9839913624. Its totient is φ = 8199928000.

The previous prime is 9019920751. The next prime is 9019920857. The reversal of 9019920811 is 1180299109.

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

It is a de Polignac number, because none of the positive numbers 2^k-9019920811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9019920881) 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, 409996390 + ... + 409996411.

It is an arithmetic number, because the mean of its divisors is an integer number (2459978406).

Almost surely, 2^9019920811 is an apocalyptic number.

9019920811 is a deficient number, since it is larger than the sum of its proper divisors (819992813).

9019920811 is a wasteful number, since it uses less digits than its factorization.

9019920811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819992812.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 9019920811 is about 94973.2636640439. The cubic root of 9019920811 is about 2081.6173942272.

The spelling of 9019920811 in words is "nine billion, nineteen million, nine hundred twenty thousand, eight hundred eleven".