1966541 has 4 divisors (see below), whose sum is σ = 1969500. Its totient is φ = 1963584.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966541 is 1456691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1110916 + 855625 = 1054^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966541 - 2¹⁰ = 1965517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966498 and 1966507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 1983.

It is an arithmetic number, because the mean of its divisors is an integer number (492375).

2^1966541 is an apocalyptic number.

It is an amenable number.

1966541 is a deficient number, since it is larger than the sum of its proper divisors (2959).

1966541 is a wasteful number, since it uses less digits than its factorization.

1966541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958.

The product of its digits is 6480, while the sum is 32.

The square root of 1966541 is about 1402.3341256634. The cubic root of 1966541 is about 125.2855551692.

The spelling of 1966541 in words is "one million, nine hundred sixty-six thousand, five hundred forty-one".