2140640251 has 2 divisors, whose sum is σ = 2140640252. Its totient is φ = 2140640250.

The previous prime is 2140640167. The next prime is 2140640269. The reversal of 2140640251 is 1520460412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2140640251 - 2¹⁷ = 2140509179 is a prime.

It is not a weakly prime, because it can be changed into another prime (2140640651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070320125 + 1070320126.

It is an arithmetic number, because the mean of its divisors is an integer number (1070320126).

Almost surely, 2^2140640251 is an apocalyptic number.

2140640251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140640251 is an equidigital number, since it uses as much as digits as its factorization.

2140640251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2140640251 is about 46267.0536235019. The cubic root of 2140640251 is about 1288.7872445328.

The spelling of 2140640251 in words is "two billion, one hundred forty million, six hundred forty thousand, two hundred fifty-one".