2018072509 has 4 divisors (see below), whose sum is σ = 2105814816. Its totient is φ = 1930330204.

The previous prime is 2018072501. The next prime is 2018072557. The reversal of 2018072509 is 9052708102.

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.

It is a cyclic number.

It is not a de Polignac number, because 2018072509 - 2³ = 2018072501 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 (2018072501) 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, 43871119 + ... + 43871164.

It is an arithmetic number, because the mean of its divisors is an integer number (526453704).

Almost surely, 2^2018072509 is an apocalyptic number.

It is an amenable number.

2018072509 is a deficient number, since it is larger than the sum of its proper divisors (87742307).

2018072509 is an equidigital number, since it uses as much as digits as its factorization.

2018072509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87742306.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 2018072509 is about 44922.9619348502. The cubic root of 2018072509 is about 1263.7046651924.

The spelling of 2018072509 in words is "two billion, eighteen million, seventy-two thousand, five hundred nine".