515091 has 4 divisors (see below), whose sum is σ = 686792. Its totient is φ = 343392.

The previous prime is 515089. The next prime is 515111. The reversal of 515091 is 190515.

It is a happy number.

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

It is not a de Polignac number, because 515091 - 2¹ = 515089 is a prime.

It is a D-number.

It is a Duffinian number.

515091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (515041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85846 + ... + 85851.

It is an arithmetic number, because the mean of its divisors is an integer number (171698).

2⁵¹⁵⁰⁹¹ is an apocalyptic number.

515091 is a deficient number, since it is larger than the sum of its proper divisors (171701).

515091 is a wasteful number, since it uses less digits than its factorization.

515091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171700.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 515091 is about 717.6984046241. The cubic root of 515091 is about 80.1606666950.

The spelling of 515091 in words is "five hundred fifteen thousand, ninety-one".