54681661 has 2 divisors, whose sum is σ = 54681662. Its totient is φ = 54681660.

The previous prime is 54681647. The next prime is 54681691. The reversal of 54681661 is 16618645.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 202500 = 7381^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 54681661 - 2⁵ = 54681629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54681661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54681611) 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 as a sum of consecutive naturals, namely, 27340830 + 27340831.

It is an arithmetic number, because the mean of its divisors is an integer number (27340831).

Almost surely, 2^54681661 is an apocalyptic number.

It is an amenable number.

54681661 is a deficient number, since it is larger than the sum of its proper divisors (1).

54681661 is an equidigital number, since it uses as much as digits as its factorization.

54681661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 54681661 is about 7394.7049298806. The cubic root of 54681661 is about 379.5601119423.

The spelling of 54681661 in words is "fifty-four million, six hundred eighty-one thousand, six hundred sixty-one".