2001022399 has 2 divisors, whose sum is σ = 2001022400. Its totient is φ = 2001022398.

The previous prime is 2001022391. The next prime is 2001022421. The reversal of 2001022399 is 9932201002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001022399 - 2³ = 2001022391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001022391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000511199 + 1000511200.

It is an arithmetic number, because the mean of its divisors is an integer number (1000511200).

Almost surely, 2^2001022399 is an apocalyptic number.

2001022399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001022399 is an equidigital number, since it uses as much as digits as its factorization.

2001022399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 2001022399 is about 44732.7888578389. The cubic root of 2001022399 is about 1260.1357036590.

The spelling of 2001022399 in words is "two billion, one million, twenty-two thousand, three hundred ninety-nine".