505953905 has 4 divisors (see below), whose sum is σ = 607144692. Its totient is φ = 404763120.

The previous prime is 505953901. The next prime is 505953937. The reversal of 505953905 is 509359505.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60575089 + 445378816 = 7783^2 + 21104^2 .

It is not a de Polignac number, because 505953905 - 2² = 505953901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505953901) 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, 50595386 + ... + 50595395.

It is an arithmetic number, because the mean of its divisors is an integer number (151786173).

Almost surely, 2^505953905 is an apocalyptic number.

It is an amenable number.

505953905 is a deficient number, since it is larger than the sum of its proper divisors (101190787).

505953905 is a wasteful number, since it uses less digits than its factorization.

505953905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101190786.

The product of its (nonzero) digits is 151875, while the sum is 41.

The square root of 505953905 is about 22493.4191487199. The cubic root of 505953905 is about 796.8385149104.

The spelling of 505953905 in words is "five hundred five million, nine hundred fifty-three thousand, nine hundred five".