2001019997 has 2 divisors, whose sum is σ = 2001019998. Its totient is φ = 2001019996.

The previous prime is 2001019967. The next prime is 2001020029. The reversal of 2001019997 is 7999101002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1412181241 + 588838756 = 37579^2 + 24266^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001019997 - 2¹⁰ = 2001018973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001019997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001019907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000509998 + 1000509999.

It is an arithmetic number, because the mean of its divisors is an integer number (1000509999).

Almost surely, 2^2001019997 is an apocalyptic number.

It is an amenable number.

2001019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001019997 is an equidigital number, since it uses as much as digits as its factorization.

2001019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 2001019997 is about 44732.7620095160. The cubic root of 2001019997 is about 1260.1351994422.

The spelling of 2001019997 in words is "two billion, one million, nineteen thousand, nine hundred ninety-seven".