18772141 has 2 divisors, whose sum is σ = 18772142. Its totient is φ = 18772140.

The previous prime is 18772139. The next prime is 18772157. The reversal of 18772141 is 14127781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11902500 + 6869641 = 3450^2 + 2621^2 .

It is a cyclic number.

It is not a de Polignac number, because 18772141 - 2¹ = 18772139 is a prime.

Together with 18772139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18772121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9386070 + 9386071.

It is an arithmetic number, because the mean of its divisors is an integer number (9386071).

Almost surely, 2^18772141 is an apocalyptic number.

It is an amenable number.

18772141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18772141 is an equidigital number, since it uses as much as digits as its factorization.

18772141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 31.

The square root of 18772141 is about 4332.6828870805. The cubic root of 18772141 is about 265.7691714880.

The spelling of 18772141 in words is "eighteen million, seven hundred seventy-two thousand, one hundred forty-one".