2009251 has 2 divisors, whose sum is σ = 2009252. Its totient is φ = 2009250.

The previous prime is 2009243. The next prime is 2009299. The reversal of 2009251 is 1529002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2009251 - 2³ = 2009243 is a prime.

It is not a weakly prime, because it can be changed into another prime (2004251) 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, 1004625 + 1004626.

It is an arithmetic number, because the mean of its divisors is an integer number (1004626).

2^2009251 is an apocalyptic number.

2009251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009251 is an equidigital number, since it uses as much as digits as its factorization.

2009251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 2009251 is about 1417.4805113299. The cubic root of 2009251 is about 126.1860650693.

Subtracting from 2009251 its reverse (1529002), we obtain a square (480249 = 693²).

The spelling of 2009251 in words is "two million, nine thousand, two hundred fifty-one".