18122501 has 2 divisors, whose sum is σ = 18122502. Its totient is φ = 18122500.

The previous prime is 18122491. The next prime is 18122509. The reversal of 18122501 is 10522181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9449476 + 8673025 = 3074^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 18122501 - 2⁶ = 18122437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18122509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061250 + 9061251.

It is an arithmetic number, because the mean of its divisors is an integer number (9061251).

Almost surely, 2^18122501 is an apocalyptic number.

It is an amenable number.

18122501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122501 is an equidigital number, since it uses as much as digits as its factorization.

18122501 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18122501 is about 4257.0530886988. The cubic root of 18122501 is about 262.6673206872.

Adding to 18122501 its reverse (10522181), we get a palindrome (28644682).

The spelling of 18122501 in words is "eighteen million, one hundred twenty-two thousand, five hundred one".