991454503 has 16 divisors (see below), whose sum is σ = 1083438720. Its totient is φ = 901764864.

The previous prime is 991454459. The next prime is 991454521. The reversal of 991454503 is 305454199.

991454503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-991454503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991454573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978225 + ... + 979237.

It is an arithmetic number, because the mean of its divisors is an integer number (67714920).

Almost surely, 2^991454503 is an apocalyptic number.

991454503 is a deficient number, since it is larger than the sum of its proper divisors (91984217).

991454503 is a wasteful number, since it uses less digits than its factorization.

991454503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 991454503 is about 31487.3705316910. The cubic root of 991454503 is about 997.1433483117.

The spelling of 991454503 in words is "nine hundred ninety-one million, four hundred fifty-four thousand, five hundred three".