2001011251 has 2 divisors, whose sum is σ = 2001011252. Its totient is φ = 2001011250.

The previous prime is 2001011203. The next prime is 2001011263. The reversal of 2001011251 is 1521101002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001011251 - 2⁷ = 2001011123 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001011651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000505625 + 1000505626.

It is an arithmetic number, because the mean of its divisors is an integer number (1000505626).

Almost surely, 2^2001011251 is an apocalyptic number.

2001011251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001011251 is an equidigital number, since it uses as much as digits as its factorization.

2001011251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 2001011251 is about 44732.6642510817. The cubic root of 2001011251 is about 1260.1333635188.

Adding to 2001011251 its reverse (1521101002), we get a palindrome (3522112253).

The spelling of 2001011251 in words is "two billion, one million, eleven thousand, two hundred fifty-one".