2140209991 has 2 divisors, whose sum is σ = 2140209992. Its totient is φ = 2140209990.

The previous prime is 2140209979. The next prime is 2140209997. The reversal of 2140209991 is 1999020412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2140209991 - 2⁵ = 2140209959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2140209991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140209997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070104995 + 1070104996.

It is an arithmetic number, because the mean of its divisors is an integer number (1070104996).

Almost surely, 2^2140209991 is an apocalyptic number.

2140209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140209991 is an equidigital number, since it uses as much as digits as its factorization.

2140209991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 2140209991 is about 46262.4036448605. The cubic root of 2140209991 is about 1288.7008917457.

The spelling of 2140209991 in words is "two billion, one hundred forty million, two hundred nine thousand, nine hundred ninety-one".