55532891 has 2 divisors, whose sum is σ = 55532892. Its totient is φ = 55532890.

The previous prime is 55532881. The next prime is 55532929. The reversal of 55532891 is 19823555.

It is an a-pointer prime, because the next prime (55532929) can be obtained adding 55532891 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55532891 is a prime.

It is not a weakly prime, because it can be changed into another prime (55532821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27766445 + 27766446.

It is an arithmetic number, because the mean of its divisors is an integer number (27766446).

Almost surely, 2^55532891 is an apocalyptic number.

55532891 is a deficient number, since it is larger than the sum of its proper divisors (1).

55532891 is an equidigital number, since it uses as much as digits as its factorization.

55532891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 38.

The square root of 55532891 is about 7452.0393852958. The cubic root of 55532891 is about 381.5195182475.

The spelling of 55532891 in words is "fifty-five million, five hundred thirty-two thousand, eight hundred ninety-one".