505403311031 has 4 divisors (see below), whose sum is σ = 509092386432. Its totient is φ = 501714235632.

The previous prime is 505403310989. The next prime is 505403311057. The reversal of 505403311031 is 130113304505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130113304505 = 5 ⋅26022660901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505403311031 is a prime.

It is a super-2 number, since 2×505403311031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505403311081) 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, 1844537495 + ... + 1844537768.

It is an arithmetic number, because the mean of its divisors is an integer number (127273096608).

Almost surely, 2^505403311031 is an apocalyptic number.

505403311031 is a deficient number, since it is larger than the sum of its proper divisors (3689075401).

505403311031 is a wasteful number, since it uses less digits than its factorization.

505403311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689075400.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 505403311031 its reverse (130113304505), we get a palindrome (635516615536).

The spelling of 505403311031 in words is "five hundred five billion, four hundred three million, three hundred eleven thousand, thirty-one".