54481681 has 2 divisors, whose sum is σ = 54481682. Its totient is φ = 54481680.

The previous prime is 54481627. The next prime is 54481703. The reversal of 54481681 is 18618445.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45427600 + 9054081 = 6740^2 + 3009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54481681 is a prime.

It is a super-2 number, since 2×54481681² = 5936507129171522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 54481681.

It is not a weakly prime, because it can be changed into another prime (54481081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27240840 + 27240841.

It is an arithmetic number, because the mean of its divisors is an integer number (27240841).

Almost surely, 2^54481681 is an apocalyptic number.

It is an amenable number.

54481681 is a deficient number, since it is larger than the sum of its proper divisors (1).

54481681 is an equidigital number, since it uses as much as digits as its factorization.

54481681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 37.

The square root of 54481681 is about 7381.1707066020. The cubic root of 54481681 is about 379.0968417465.

The spelling of 54481681 in words is "fifty-four million, four hundred eighty-one thousand, six hundred eighty-one".