55547771 has 2 divisors, whose sum is σ = 55547772. Its totient is φ = 55547770.

The previous prime is 55547747. The next prime is 55547777. The reversal of 55547771 is 17774555.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55547771 - 2¹⁴ = 55531387 is a prime.

It is not a weakly prime, because it can be changed into another prime (55547777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27773885 + 27773886.

It is an arithmetic number, because the mean of its divisors is an integer number (27773886).

Almost surely, 2^55547771 is an apocalyptic number.

55547771 is a deficient number, since it is larger than the sum of its proper divisors (1).

55547771 is an equidigital number, since it uses as much as digits as its factorization.

55547771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171500, while the sum is 41.

The square root of 55547771 is about 7453.0377028430. The cubic root of 55547771 is about 381.5535911687.

The spelling of 55547771 in words is "fifty-five million, five hundred forty-seven thousand, seven hundred seventy-one".