991738103 has 2 divisors, whose sum is σ = 991738104. Its totient is φ = 991738102.

The previous prime is 991738093. The next prime is 991738133. The reversal of 991738103 is 301837199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991738103 - 2¹⁴ = 991721719 is a prime.

It is a super-3 number, since 3×991738103³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991738133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495869051 + 495869052.

It is an arithmetic number, because the mean of its divisors is an integer number (495869052).

Almost surely, 2^991738103 is an apocalyptic number.

991738103 is a deficient number, since it is larger than the sum of its proper divisors (1).

991738103 is an equidigital number, since it uses as much as digits as its factorization.

991738103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 991738103 is about 31491.8736025661. The cubic root of 991738103 is about 997.2384150019.

The spelling of 991738103 in words is "nine hundred ninety-one million, seven hundred thirty-eight thousand, one hundred three".