18225501 has 12 divisors (see below), whose sum is σ = 28268352. Its totient is φ = 10414488.

The previous prime is 18225491. The next prime is 18225523. The reversal of 18225501 is 10552281.

It is not a de Polignac number, because 18225501 - 2⁵ = 18225469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61845 + ... + 62138.

It is an arithmetic number, because the mean of its divisors is an integer number (2355696).

Almost surely, 2^18225501 is an apocalyptic number.

It is an amenable number.

18225501 is a deficient number, since it is larger than the sum of its proper divisors (10042851).

18225501 is a wasteful number, since it uses less digits than its factorization.

18225501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124000 (or 123993 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 18225501 is about 4269.1335186429. The cubic root of 18225501 is about 263.1640078292.

Adding to 18225501 its reverse (10552281), we get a palindrome (28777782).

The spelling of 18225501 in words is "eighteen million, two hundred twenty-five thousand, five hundred one".