55890997 has 2 divisors, whose sum is σ = 55890998. Its totient is φ = 55890996.

The previous prime is 55890977. The next prime is 55891001. The reversal of 55890997 is 79909855.

55890997 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., 51251281 + 4639716 = 7159^2 + 2154^2 .

It is a cyclic number.

It is not a de Polignac number, because 55890997 - 2¹⁹ = 55366709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55890977) 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, 27945498 + 27945499.

It is an arithmetic number, because the mean of its divisors is an integer number (27945499).

Almost surely, 2^55890997 is an apocalyptic number.

It is an amenable number.

55890997 is a deficient number, since it is larger than the sum of its proper divisors (1).

55890997 is an equidigital number, since it uses as much as digits as its factorization.

55890997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The square root of 55890997 is about 7476.0281567153. The cubic root of 55890997 is about 382.3378428942.

The spelling of 55890997 in words is "fifty-five million, eight hundred ninety thousand, nine hundred ninety-seven".