2001252251 has 2 divisors, whose sum is σ = 2001252252. Its totient is φ = 2001252250.

The previous prime is 2001252233. The next prime is 2001252283. The reversal of 2001252251 is 1522521002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001252251 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2000252251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000626125 + 1000626126.

It is an arithmetic number, because the mean of its divisors is an integer number (1000626126).

Almost surely, 2^2001252251 is an apocalyptic number.

2001252251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001252251 is an equidigital number, since it uses as much as digits as its factorization.

2001252251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2001252251 is about 44735.3579509542. The cubic root of 2001252251 is about 1260.1839512652.

Adding to 2001252251 its reverse (1522521002), we get a palindrome (3523773253).

The spelling of 2001252251 in words is "two billion, one million, two hundred fifty-two thousand, two hundred fifty-one".