2640251 has 2 divisors, whose sum is σ = 2640252. Its totient is φ = 2640250.

The previous prime is 2640227. The next prime is 2640271. The reversal of 2640251 is 1520462.

It is a happy number.

2640251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (2640271) can be obtained adding 2640251 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2640251 - 2¹⁴ = 2623867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2640271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320125 + 1320126.

It is an arithmetic number, because the mean of its divisors is an integer number (1320126).

2^2640251 is an apocalyptic number.

2640251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640251 is an equidigital number, since it uses as much as digits as its factorization.

2640251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2640251 is about 1624.8849190020. The cubic root of 2640251 is about 138.2128445529.

The spelling of 2640251 in words is "two million, six hundred forty thousand, two hundred fifty-one".