503121042 has 24 divisors (see below), whose sum is σ = 1119559116. Its totient is φ = 163174176.

The previous prime is 503121013. The next prime is 503121043. The reversal of 503121042 is 240121305.

503121042 is a `hidden beast` number, since 503 + 121 + 0 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 487129041 + 15992001 = 22071^2 + 3999^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (503121043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 377053 + ... + 378384.

Almost surely, 2^503121042 is an apocalyptic number.

503121042 is an abundant number, since it is smaller than the sum of its proper divisors (616438074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

503121042 is a wasteful number, since it uses less digits than its factorization.

503121042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755482 (or 755479 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 503121042 is about 22430.3598276978. The cubic root of 503121042 is about 795.3485501421.

Adding to 503121042 its reverse (240121305), we get a palindrome (743242347).

The spelling of 503121042 in words is "five hundred three million, one hundred twenty-one thousand, forty-two".