18864541 has 2 divisors, whose sum is σ = 18864542. Its totient is φ = 18864540.

The previous prime is 18864533. The next prime is 18864557. The reversal of 18864541 is 14546881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 980100 = 4229^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 18864541 - 2³ = 18864533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18864541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18864341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9432270 + 9432271.

It is an arithmetic number, because the mean of its divisors is an integer number (9432271).

Almost surely, 2^18864541 is an apocalyptic number.

It is an amenable number.

18864541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18864541 is an equidigital number, since it uses as much as digits as its factorization.

18864541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 18864541 is about 4343.3329368125. The cubic root of 18864541 is about 266.2045132312.

The spelling of 18864541 in words is "eighteen million, eight hundred sixty-four thousand, five hundred forty-one".