503423551 has 4 divisors (see below), whose sum is σ = 508128552. Its totient is φ = 498718552.

The previous prime is 503423513. The next prime is 503423561. The reversal of 503423551 is 155324305.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-503423551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (503423561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352340 + ... + 2352553.

It is an arithmetic number, because the mean of its divisors is an integer number (127032138).

Almost surely, 2^503423551 is an apocalyptic number.

503423551 is a deficient number, since it is larger than the sum of its proper divisors (4705001).

503423551 is a wasteful number, since it uses less digits than its factorization.

503423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705000.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 503423551 is about 22437.1021078926. The cubic root of 503423551 is about 795.5079232479.

Adding to 503423551 its reverse (155324305), we get a palindrome (658747856).

The spelling of 503423551 in words is "five hundred three million, four hundred twenty-three thousand, five hundred fifty-one".