18711541 has 2 divisors, whose sum is σ = 18711542. Its totient is φ = 18711540.

The previous prime is 18711527. The next prime is 18711551. The reversal of 18711541 is 14511781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 4498641 = 3770^2 + 2121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18711541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18711521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9355770 + 9355771.

It is an arithmetic number, because the mean of its divisors is an integer number (9355771).

Almost surely, 2^18711541 is an apocalyptic number.

It is an amenable number.

18711541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18711541 is an equidigital number, since it uses as much as digits as its factorization.

18711541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 28.

The square root of 18711541 is about 4325.6838765680. The cubic root of 18711541 is about 265.4828789160.

The spelling of 18711541 in words is "eighteen million, seven hundred eleven thousand, five hundred forty-one".