252555509 has 4 divisors (see below), whose sum is σ = 252588204. Its totient is φ = 252522816.

The previous prime is 252555473. The next prime is 252555517. The reversal of 252555509 is 905555252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 210888484 + 41667025 = 14522^2 + 6455^2 .

It is a cyclic number.

It is not a de Polignac number, because 252555509 - 2¹⁶ = 252489973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252555539) 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, 2429 + ... + 22605.

It is an arithmetic number, because the mean of its divisors is an integer number (63147051).

Almost surely, 2^252555509 is an apocalyptic number.

It is an amenable number.

252555509 is a deficient number, since it is larger than the sum of its proper divisors (32695).

252555509 is a wasteful number, since it uses less digits than its factorization.

252555509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32694.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 252555509 is about 15891.9951233317. The cubic root of 252555509 is about 632.0997454129.

The spelling of 252555509 in words is "two hundred fifty-two million, five hundred fifty-five thousand, five hundred nine".