505891172 has 6 divisors (see below), whose sum is σ = 885309558. Its totient is φ = 252945584.

The previous prime is 505891171. The next prime is 505891189. The reversal of 505891172 is 271198505.

It can be written as a sum of positive squares in only one way, i.e., 455566336 + 50324836 = 21344^2 + 7094^2 .

It is not an unprimeable number, because it can be changed into a prime (505891171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63236393 + ... + 63236400.

It is an arithmetic number, because the mean of its divisors is an integer number (147551593).

Almost surely, 2^505891172 is an apocalyptic number.

It is an amenable number.

505891172 is a deficient number, since it is larger than the sum of its proper divisors (379418386).

505891172 is a wasteful number, since it uses less digits than its factorization.

505891172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126472797 (or 126472795 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 505891172 is about 22492.0246309664. The cubic root of 505891172 is about 796.8055803313.

The spelling of 505891172 in words is "five hundred five million, eight hundred ninety-one thousand, one hundred seventy-two".