18145501 has 4 divisors (see below), whose sum is σ = 19795104. Its totient is φ = 16495900.

The previous prime is 18145489. The next prime is 18145529. The reversal of 18145501 is 10554181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10554181 = 11 ⋅959471.

It is a cyclic number.

It is not a de Polignac number, because 18145501 - 2⁹ = 18144989 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 (18145801) 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, 824785 + ... + 824806.

It is an arithmetic number, because the mean of its divisors is an integer number (4948776).

Almost surely, 2^18145501 is an apocalyptic number.

18145501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18145501 is a deficient number, since it is larger than the sum of its proper divisors (1649603).

18145501 is a wasteful number, since it uses less digits than its factorization.

18145501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649602.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 18145501 is about 4259.7536313735. The cubic root of 18145501 is about 262.7783942894.

Adding to 18145501 its reverse (10554181), we get a palindrome (28699682).

The spelling of 18145501 in words is "eighteen million, one hundred forty-five thousand, five hundred one".