18140501 has 2 divisors, whose sum is σ = 18140502. Its totient is φ = 18140500.

The previous prime is 18140489. The next prime is 18140503. The reversal of 18140501 is 10504181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9579025 + 8561476 = 3095^2 + 2926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18140501 is a prime.

Together with 18140503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18140503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070250 + 9070251.

It is an arithmetic number, because the mean of its divisors is an integer number (9070251).

Almost surely, 2^18140501 is an apocalyptic number.

It is an amenable number.

18140501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140501 is an equidigital number, since it uses as much as digits as its factorization.

18140501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18140501 is about 4259.1667025370. The cubic root of 18140501 is about 262.7542558419.

Adding to 18140501 its reverse (10504181), we get a palindrome (28644682).

The spelling of 18140501 in words is "eighteen million, one hundred forty thousand, five hundred one".