55288991 has 2 divisors, whose sum is σ = 55288992. Its totient is φ = 55288990.

The previous prime is 55288973. The next prime is 55289011. The reversal of 55288991 is 19988255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55288991 - 2¹⁸ = 55026847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55288391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27644495 + 27644496.

It is an arithmetic number, because the mean of its divisors is an integer number (27644496).

Almost surely, 2^55288991 is an apocalyptic number.

55288991 is a deficient number, since it is larger than the sum of its proper divisors (1).

55288991 is an equidigital number, since it uses as much as digits as its factorization.

55288991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 47.

The square root of 55288991 is about 7435.6567295700. The cubic root of 55288991 is about 380.9601550127.

The spelling of 55288991 in words is "fifty-five million, two hundred eighty-eight thousand, nine hundred ninety-one".