2028191931 has 6 divisors (see below), whose sum is σ = 2929610580. Its totient is φ = 1352127948.

The previous prime is 2028191887. The next prime is 2028191933. The reversal of 2028191931 is 1391918202.

It is not a de Polignac number, because 2028191931 - 2¹¹ = 2028189883 is a prime.

It is a super-2 number, since 2×2028191931² = 8227125017947017522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2028191933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112677321 + ... + 112677338.

It is an arithmetic number, because the mean of its divisors is an integer number (488268430).

Almost surely, 2^2028191931 is an apocalyptic number.

2028191931 is a deficient number, since it is larger than the sum of its proper divisors (901418649).

2028191931 is a wasteful number, since it uses less digits than its factorization.

2028191931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225354665 (or 225354662 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 2028191931 is about 45035.4519351144. The cubic root of 2028191931 is about 1265.8133845160.

The spelling of 2028191931 in words is "two billion, twenty-eight million, one hundred ninety-one thousand, nine hundred thirty-one".