503440091 has 16 divisors (see below), whose sum is σ = 664588800. Its totient is φ = 369214080.

The previous prime is 503440073. The next prime is 503440103. The reversal of 503440091 is 190044305.

It is a cyclic number.

It is not a de Polignac number, because 503440091 - 2⁶ = 503440027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 503440091.

It is not an unprimeable number, because it can be changed into a prime (503440291) 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, 190991 + ... + 193608.

It is an arithmetic number, because the mean of its divisors is an integer number (41536800).

Almost surely, 2^503440091 is an apocalyptic number.

503440091 is a deficient number, since it is larger than the sum of its proper divisors (161148709).

503440091 is a wasteful number, since it uses less digits than its factorization.

503440091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384634.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 503440091 is about 22437.4706907887. The cubic root of 503440091 is about 795.5166353002.

Adding to 503440091 its reverse (190044305), we get a palindrome (693484396).

The spelling of 503440091 in words is "five hundred three million, four hundred forty thousand, ninety-one".