541611661 has 4 divisors (see below), whose sum is σ = 556249852. Its totient is φ = 526973472.

The previous prime is 541611641. The next prime is 541611667. The reversal of 541611661 is 166116145.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 265885636 + 275726025 = 16306^2 + 16605^2 .

It is a cyclic number.

It is not a de Polignac number, because 541611661 - 2⁷ = 541611533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (541611667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7319040 + ... + 7319113.

It is an arithmetic number, because the mean of its divisors is an integer number (139062463).

Almost surely, 2^541611661 is an apocalyptic number.

It is an amenable number.

541611661 is a deficient number, since it is larger than the sum of its proper divisors (14638191).

541611661 is a wasteful number, since it uses less digits than its factorization.

541611661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14638190.

The product of its digits is 4320, while the sum is 31.

The square root of 541611661 is about 23272.5516649980. The cubic root of 541611661 is about 815.1346138693.

The spelling of 541611661 in words is "five hundred forty-one million, six hundred eleven thousand, six hundred sixty-one".