505657009 has 16 divisors (see below), whose sum is σ = 596413440. Its totient is φ = 422645760.

The previous prime is 505657007. The next prime is 505657037. The reversal of 505657009 is 900756505.

It is a cyclic number.

It is not a de Polignac number, because 505657009 - 2¹ = 505657007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505657007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29872 + ... + 43630.

It is an arithmetic number, because the mean of its divisors is an integer number (37275840).

Almost surely, 2^505657009 is an apocalyptic number.

It is an amenable number.

505657009 is a deficient number, since it is larger than the sum of its proper divisors (90756431).

505657009 is a wasteful number, since it uses less digits than its factorization.

505657009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040.

The product of its (nonzero) digits is 47250, while the sum is 37.

The square root of 505657009 is about 22486.8185611037. The cubic root of 505657009 is about 796.6826216195.

The spelling of 505657009 in words is "five hundred five million, six hundred fifty-seven thousand, nine".