18481501 has 2 divisors, whose sum is σ = 18481502. Its totient is φ = 18481500.

The previous prime is 18481459. The next prime is 18481511. The reversal of 18481501 is 10518481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18481401 + 100 = 4299^2 + 10^2 .

It is an emirp because it is prime and its reverse (10518481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18481501 - 2¹¹ = 18479453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18481501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18481511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9240750 + 9240751.

It is an arithmetic number, because the mean of its divisors is an integer number (9240751).

Almost surely, 2^18481501 is an apocalyptic number.

It is an amenable number.

18481501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18481501 is an equidigital number, since it uses as much as digits as its factorization.

18481501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 18481501 is about 4299.0116305960. The cubic root of 18481501 is about 264.3904394592.

Adding to 18481501 its reverse (10518481), we get a palindrome (28999982).

The spelling of 18481501 in words is "eighteen million, four hundred eighty-one thousand, five hundred one".