18025513 has 4 divisors (see below), whose sum is σ = 19664208. Its totient is φ = 16386820.

The previous prime is 18025499. The next prime is 18025517. The reversal of 18025513 is 31552081.

It is a happy number.

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 18025513 - 2⁹ = 18025001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18025517) 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, 819331 + ... + 819352.

It is an arithmetic number, because the mean of its divisors is an integer number (4916052).

Almost surely, 2^18025513 is an apocalyptic number.

It is an amenable number.

18025513 is a deficient number, since it is larger than the sum of its proper divisors (1638695).

18025513 is a wasteful number, since it uses less digits than its factorization.

18025513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638694.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 18025513 is about 4245.6463583299. The cubic root of 18025513 is about 262.1979012908.

Adding to 18025513 its reverse (31552081), we get a palindrome (49577594).

The spelling of 18025513 in words is "eighteen million, twenty-five thousand, five hundred thirteen".