505721043 has 32 divisors (see below), whose sum is σ = 796857600. Its totient is φ = 316078848.

The previous prime is 505721017. The next prime is 505721063. The reversal of 505721043 is 340127505.

It is a happy number.

505721043 is a `hidden beast` number, since 50 + 572 + 1 + 0 + 43 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-505721043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 505720998 and 505721016.

It is not an unprimeable number, because it can be changed into a prime (505721063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44680 + ... + 54842.

It is an arithmetic number, because the mean of its divisors is an integer number (24901800).

Almost surely, 2^505721043 is an apocalyptic number.

505721043 is a deficient number, since it is larger than the sum of its proper divisors (291136557).

505721043 is a wasteful number, since it uses less digits than its factorization.

505721043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288 (or 10282 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 505721043 is about 22488.2423279366. The cubic root of 505721043 is about 796.7162495667.

Adding to 505721043 its reverse (340127505), we get a palindrome (845848548).

It can be divided in two parts, 50572 and 1043, that added together give a palindrome (51615).

The spelling of 505721043 in words is "five hundred five million, seven hundred twenty-one thousand, forty-three".