54569681 has 2 divisors, whose sum is σ = 54569682. Its totient is φ = 54569680.

The previous prime is 54569663. The next prime is 54569689. The reversal of 54569681 is 18696545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54523456 + 46225 = 7384^2 + 215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54569681 is a prime.

It is a super-2 number, since 2×54569681² = 5955700168883522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54569689) 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, 27284840 + 27284841.

It is an arithmetic number, because the mean of its divisors is an integer number (27284841).

Almost surely, 2^54569681 is an apocalyptic number.

It is an amenable number.

54569681 is a deficient number, since it is larger than the sum of its proper divisors (1).

54569681 is an equidigital number, since it uses as much as digits as its factorization.

54569681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 44.

The square root of 54569681 is about 7387.1294154089. The cubic root of 54569681 is about 379.3008404486.

The spelling of 54569681 in words is "fifty-four million, five hundred sixty-nine thousand, six hundred eighty-one".