55492781 has 2 divisors, whose sum is σ = 55492782. Its totient is φ = 55492780.

The previous prime is 55492771. The next prime is 55492783. The reversal of 55492781 is 18729455.

55492781 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., 51351556 + 4141225 = 7166^2 + 2035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55492781 is a prime.

It is a super-2 number, since 2×55492781² = 6158897486227922, which contains 22 as substring.

Together with 55492783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55492783) 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, 27746390 + 27746391.

It is an arithmetic number, because the mean of its divisors is an integer number (27746391).

Almost surely, 2^55492781 is an apocalyptic number.

It is an amenable number.

55492781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55492781 is an equidigital number, since it uses as much as digits as its factorization.

55492781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 55492781 is about 7449.3476895632. The cubic root of 55492781 is about 381.4276421639.

The spelling of 55492781 in words is "fifty-five million, four hundred ninety-two thousand, seven hundred eighty-one".