55045531 has 2 divisors, whose sum is σ = 55045532. Its totient is φ = 55045530.

The previous prime is 55045513. The next prime is 55045583. The reversal of 55045531 is 13554055.

Together with previous prime (55045513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55045531 - 2¹⁷ = 54914459 is a prime.

It is a super-2 number, since 2×55045531² = 6060020966143922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55045531.

It is not a weakly prime, because it can be changed into another prime (55045511) 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, 27522765 + 27522766.

It is an arithmetic number, because the mean of its divisors is an integer number (27522766).

Almost surely, 2^55045531 is an apocalyptic number.

55045531 is a deficient number, since it is larger than the sum of its proper divisors (1).

55045531 is an equidigital number, since it uses as much as digits as its factorization.

55045531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 55045531 is about 7419.2675514501. The cubic root of 55045531 is about 380.4001578761.

Adding to 55045531 its reverse (13554055), we get a palindrome (68599586).

The spelling of 55045531 in words is "fifty-five million, forty-five thousand, five hundred thirty-one".