2140209997 has 2 divisors, whose sum is σ = 2140209998. Its totient is φ = 2140209996.

The previous prime is 2140209991. The next prime is 2140210021. The reversal of 2140209997 is 7999020412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1877575561 + 262634436 = 43331^2 + 16206^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140209997 - 2²³ = 2131821389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2140209991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070104998 + 1070104999.

It is an arithmetic number, because the mean of its divisors is an integer number (1070104999).

Almost surely, 2^2140209997 is an apocalyptic number.

It is an amenable number.

2140209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140209997 is an equidigital number, since it uses as much as digits as its factorization.

2140209997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 2140209997 is about 46262.4037097080. The cubic root of 2140209997 is about 1288.7008929500.

The spelling of 2140209997 in words is "two billion, one hundred forty million, two hundred nine thousand, nine hundred ninety-seven".