2140731971 has 4 divisors (see below), whose sum is σ = 2446550832. Its totient is φ = 1834913112.

The previous prime is 2140731961. The next prime is 2140731991. The reversal of 2140731971 is 1791370412.

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 2140731971 - 2¹⁸ = 2140469827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2140731961) 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, 152909420 + ... + 152909433.

It is an arithmetic number, because the mean of its divisors is an integer number (611637708).

Almost surely, 2^2140731971 is an apocalyptic number.

2140731971 is a deficient number, since it is larger than the sum of its proper divisors (305818861).

2140731971 is an equidigital number, since it uses as much as digits as its factorization.

2140731971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305818860.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 2140731971 is about 46268.0448149692. The cubic root of 2140731971 is about 1288.8056511564.

The spelling of 2140731971 in words is "two billion, one hundred forty million, seven hundred thirty-one thousand, nine hundred seventy-one".