18751541 has 2 divisors, whose sum is σ = 18751542. Its totient is φ = 18751540.

The previous prime is 18751441. The next prime is 18751549. The reversal of 18751541 is 14515781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 1768900 = 4121^2 + 1330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18751541 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18751498 and 18751507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18751549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375770 + 9375771.

It is an arithmetic number, because the mean of its divisors is an integer number (9375771).

Almost surely, 2^18751541 is an apocalyptic number.

It is an amenable number.

18751541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751541 is an equidigital number, since it uses as much as digits as its factorization.

18751541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 18751541 is about 4330.3049546192. The cubic root of 18751541 is about 265.6719201267.

The spelling of 18751541 in words is "eighteen million, seven hundred fifty-one thousand, five hundred forty-one".