55847021 has 2 divisors, whose sum is σ = 55847022. Its totient is φ = 55847020.

The previous prime is 55847017. The next prime is 55847039. The reversal of 55847021 is 12074855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45414121 + 10432900 = 6739^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 55847021 - 2² = 55847017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55847081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27923510 + 27923511.

It is an arithmetic number, because the mean of its divisors is an integer number (27923511).

Almost surely, 2^55847021 is an apocalyptic number.

It is an amenable number.

55847021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55847021 is an equidigital number, since it uses as much as digits as its factorization.

55847021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 55847021 is about 7473.0864440337. The cubic root of 55847021 is about 382.2375399142.

The spelling of 55847021 in words is "fifty-five million, eight hundred forty-seven thousand, twenty-one".