55201681 has 2 divisors, whose sum is σ = 55201682. Its totient is φ = 55201680.

The previous prime is 55201613. The next prime is 55201687. The reversal of 55201681 is 18610255.

55201681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35700625 + 19501056 = 5975^2 + 4416^2 .

It is a cyclic number.

It is not a de Polignac number, because 55201681 - 2⁹ = 55201169 is a prime.

It is a super-2 number, since 2×55201681² = 6094451170451522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55201687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27600840 + 27600841.

It is an arithmetic number, because the mean of its divisors is an integer number (27600841).

Almost surely, 2^55201681 is an apocalyptic number.

It is an amenable number.

55201681 is a deficient number, since it is larger than the sum of its proper divisors (1).

55201681 is an equidigital number, since it uses as much as digits as its factorization.

55201681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 55201681 is about 7429.7833750386. The cubic root of 55201681 is about 380.7595173912.

The spelling of 55201681 in words is "fifty-five million, two hundred one thousand, six hundred eighty-one".