55421533 has 2 divisors, whose sum is σ = 55421534. Its totient is φ = 55421532.

The previous prime is 55421503. The next prime is 55421543. The reversal of 55421533 is 33512455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34609689 + 20811844 = 5883^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421533 - 2²⁵ = 21867101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55421503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710766 + 27710767.

It is an arithmetic number, because the mean of its divisors is an integer number (27710767).

Almost surely, 2^55421533 is an apocalyptic number.

It is an amenable number.

55421533 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421533 is an equidigital number, since it uses as much as digits as its factorization.

55421533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 28.

The square root of 55421533 is about 7444.5639899191. The cubic root of 55421533 is about 381.2643320600.

Adding to 55421533 its reverse (33512455), we get a palindrome (88933988).

The spelling of 55421533 in words is "fifty-five million, four hundred twenty-one thousand, five hundred thirty-three".