503400031 has 2 divisors, whose sum is σ = 503400032. Its totient is φ = 503400030.

The previous prime is 503399993. The next prime is 503400083. The reversal of 503400031 is 130004305.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 503400031 - 2¹³ = 503391839 is a prime.

It is a super-2 number, since 2×503400031² = 506823182421601922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 503399978 and 503400014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (503400431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251700015 + 251700016.

It is an arithmetic number, because the mean of its divisors is an integer number (251700016).

Almost surely, 2^503400031 is an apocalyptic number.

503400031 is a deficient number, since it is larger than the sum of its proper divisors (1).

503400031 is an equidigital number, since it uses as much as digits as its factorization.

503400031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 503400031 is about 22436.5779699133. The cubic root of 503400031 is about 795.4955343177.

Adding to 503400031 its reverse (130004305), we get a palindrome (633404336).

The spelling of 503400031 in words is "five hundred three million, four hundred thousand, thirty-one".