991003723 has 2 divisors, whose sum is σ = 991003724. Its totient is φ = 991003722.

The previous prime is 991003709. The next prime is 991003759. The reversal of 991003723 is 327300199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991003723 - 2¹⁷ = 990872651 is a prime.

It is not a weakly prime, because it can be changed into another prime (991003823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495501861 + 495501862.

It is an arithmetic number, because the mean of its divisors is an integer number (495501862).

Almost surely, 2^991003723 is an apocalyptic number.

991003723 is a deficient number, since it is larger than the sum of its proper divisors (1).

991003723 is an equidigital number, since it uses as much as digits as its factorization.

991003723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 991003723 is about 31480.2116098352. The cubic root of 991003723 is about 996.9922032289.

The spelling of 991003723 in words is "nine hundred ninety-one million, three thousand, seven hundred twenty-three".