1001243689 has 2 divisors, whose sum is σ = 1001243690. Its totient is φ = 1001243688.

The previous prime is 1001243669. The next prime is 1001243699. The reversal of 1001243689 is 9863421001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620408464 + 380835225 = 24908^2 + 19515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001243689 - 2¹⁷ = 1001112617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001243609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500621844 + 500621845.

It is an arithmetic number, because the mean of its divisors is an integer number (500621845).

Almost surely, 2^1001243689 is an apocalyptic number.

It is an amenable number.

1001243689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001243689 is an equidigital number, since it uses as much as digits as its factorization.

1001243689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1001243689 is about 31642.4349410724. The cubic root of 1001243689 is about 1000.4143912562.

The spelling of 1001243689 in words is "one billion, one million, two hundred forty-three thousand, six hundred eighty-nine".