18971541 has 12 divisors (see below), whose sum is σ = 29015532. Its totient is φ = 11903616.

The previous prime is 18971521. The next prime is 18971567. The reversal of 18971541 is 14517981.

It can be written as a sum of positive squares in 2 ways, for example, as 9180900 + 9790641 = 3030^2 + 3129^2 .

It is not a de Polignac number, because 18971541 - 2¹⁰ = 18970517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18971496 and 18971505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971521) 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 in 11 ways as a sum of consecutive naturals, for example, 61846 + ... + 62151.

It is an arithmetic number, because the mean of its divisors is an integer number (2417961).

Almost surely, 2^18971541 is an apocalyptic number.

It is an amenable number.

18971541 is a deficient number, since it is larger than the sum of its proper divisors (10043991).

18971541 is a wasteful number, since it uses less digits than its factorization.

18971541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124020 (or 124017 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 18971541 is about 4355.6332490236. The cubic root of 18971541 is about 266.7068701538.

The spelling of 18971541 in words is "eighteen million, nine hundred seventy-one thousand, five hundred forty-one".