1001099903 has 2 divisors, whose sum is σ = 1001099904. Its totient is φ = 1001099902.

The previous prime is 1001099867. The next prime is 1001099971. The reversal of 1001099903 is 3099901001.

It is a weak prime.

It is an emirp because it is prime and its reverse (3099901001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001099903 - 2¹⁴ = 1001083519 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001099903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001099003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500549951 + 500549952.

It is an arithmetic number, because the mean of its divisors is an integer number (500549952).

Almost surely, 2^1001099903 is an apocalyptic number.

1001099903 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001099903 is an equidigital number, since it uses as much as digits as its factorization.

1001099903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 1001099903 is about 31640.1628156367. The cubic root of 1001099903 is about 1000.3664999947.

The spelling of 1001099903 in words is "one billion, one million, ninety-nine thousand, nine hundred three".