18212503 has 2 divisors, whose sum is σ = 18212504. Its totient is φ = 18212502.

The previous prime is 18212489. The next prime is 18212561. The reversal of 18212503 is 30521281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18212503 - 2¹³ = 18204311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18212303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106251 + 9106252.

It is an arithmetic number, because the mean of its divisors is an integer number (9106252).

Almost surely, 2^18212503 is an apocalyptic number.

18212503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212503 is an equidigital number, since it uses as much as digits as its factorization.

18212503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18212503 is about 4267.6109241589. The cubic root of 18212503 is about 263.1014321509.

Adding to 18212503 its reverse (30521281), we get a palindrome (48733784).

It can be divided in two parts, 18 and 212503, that added together give a square (212521 = 461²).

The spelling of 18212503 in words is "eighteen million, two hundred twelve thousand, five hundred three".