2001495721 has 2 divisors, whose sum is σ = 2001495722. Its totient is φ = 2001495720.

The previous prime is 2001495679. The next prime is 2001495733. The reversal of 2001495721 is 1275941002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1947986496 + 53509225 = 44136^2 + 7315^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001495721 - 2²⁹ = 1464624809 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001495791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000747860 + 1000747861.

It is an arithmetic number, because the mean of its divisors is an integer number (1000747861).

Almost surely, 2^2001495721 is an apocalyptic number.

It is an amenable number.

2001495721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001495721 is an equidigital number, since it uses as much as digits as its factorization.

2001495721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 2001495721 is about 44738.0790937653. The cubic root of 2001495721 is about 1260.2350533597.

The spelling of 2001495721 in words is "two billion, one million, four hundred ninety-five thousand, seven hundred twenty-one".