54181661 has 4 divisors (see below), whose sum is σ = 54214524. Its totient is φ = 54148800.

The previous prime is 54181643. The next prime is 54181663. The reversal of 54181661 is 16618145.

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 9211225 + 44970436 = 3035^2 + 6706^2 .

It is a cyclic number.

It is not a de Polignac number, because 54181661 - 2¹⁸ = 53919517 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 (54181663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13820 + ... + 17301.

It is an arithmetic number, because the mean of its divisors is an integer number (13553631).

Almost surely, 2^54181661 is an apocalyptic number.

It is an amenable number.

54181661 is a deficient number, since it is larger than the sum of its proper divisors (32863).

54181661 is a wasteful number, since it uses less digits than its factorization.

54181661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32862.

The product of its digits is 5760, while the sum is 32.

The square root of 54181661 is about 7360.8193158099. The cubic root of 54181661 is about 378.3996896727.

The spelling of 54181661 in words is "fifty-four million, one hundred eighty-one thousand, six hundred sixty-one".