20010231191 has 4 divisors (see below), whose sum is σ = 21187303632. Its totient is φ = 18833158752.

The previous prime is 20010231161. The next prime is 20010231211. The reversal of 20010231191 is 19113201002.

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 20010231191 - 2²⁶ = 19943122327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010231151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588536195 + ... + 588536228.

It is an arithmetic number, because the mean of its divisors is an integer number (5296825908).

Almost surely, 2^20010231191 is an apocalyptic number.

20010231191 is a deficient number, since it is larger than the sum of its proper divisors (1177072441).

20010231191 is a wasteful number, since it uses less digits than its factorization.

20010231191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177072440.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20010231191 its reverse (19113201002), we get a palindrome (39123432193).

The spelling of 20010231191 in words is "twenty billion, ten million, two hundred thirty-one thousand, one hundred ninety-one".