55643461 has 2 divisors, whose sum is σ = 55643462. Its totient is φ = 55643460.

The previous prime is 55643459. The next prime is 55643503. The reversal of 55643461 is 16434655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 3587236 = 7215^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 55643461 - 2¹ = 55643459 is a prime.

Together with 55643459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55644461) 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, 27821730 + 27821731.

It is an arithmetic number, because the mean of its divisors is an integer number (27821731).

Almost surely, 2^55643461 is an apocalyptic number.

It is an amenable number.

55643461 is a deficient number, since it is larger than the sum of its proper divisors (1).

55643461 is an equidigital number, since it uses as much as digits as its factorization.

55643461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 34.

The square root of 55643461 is about 7459.4544706701. The cubic root of 55643461 is about 381.7725613586.

It can be divided in two parts, 5564 and 3461, that added together give a square (9025 = 95²).

The spelling of 55643461 in words is "fifty-five million, six hundred forty-three thousand, four hundred sixty-one".