509212513 has 4 divisors (see below), whose sum is σ = 510578068. Its totient is φ = 507846960.

The previous prime is 509212481. The next prime is 509212621. The reversal of 509212513 is 315212905.

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 418734369 + 90478144 = 20463^2 + 9512^2 .

It is not a de Polignac number, because 509212513 - 2⁵ = 509212481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509212313) 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, 682218 + ... + 682963.

It is an arithmetic number, because the mean of its divisors is an integer number (127644517).

Almost surely, 2^509212513 is an apocalyptic number.

It is an amenable number.

509212513 is a deficient number, since it is larger than the sum of its proper divisors (1365555).

509212513 is a wasteful number, since it uses less digits than its factorization.

509212513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365554.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 509212513 is about 22565.7375904268. The cubic root of 509212513 is about 798.5455411435.

The spelling of 509212513 in words is "five hundred nine million, two hundred twelve thousand, five hundred thirteen".