515138909 has 4 divisors (see below), whose sum is σ = 518016960. Its totient is φ = 512260860.

The previous prime is 515138903. The next prime is 515138917. The reversal of 515138909 is 909831515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 909831515 = 5 ⋅181966303.

It is a cyclic number.

It is not a de Polignac number, because 515138909 - 2⁸ = 515138653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515138903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438757 + ... + 1439114.

It is an arithmetic number, because the mean of its divisors is an integer number (129504240).

Almost surely, 2^515138909 is an apocalyptic number.

It is an amenable number.

515138909 is a deficient number, since it is larger than the sum of its proper divisors (2878051).

515138909 is a wasteful number, since it uses less digits than its factorization.

515138909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878050.

The product of its (nonzero) digits is 48600, while the sum is 41.

The square root of 515138909 is about 22696.6717604146. The cubic root of 515138909 is about 801.6315188584.

The spelling of 515138909 in words is "five hundred fifteen million, one hundred thirty-eight thousand, nine hundred nine".