55385321 has 2 divisors, whose sum is σ = 55385322. Its totient is φ = 55385320.

The previous prime is 55385293. The next prime is 55385327. The reversal of 55385321 is 12358355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54922921 + 462400 = 7411^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 55385321 - 2⁶ = 55385257 is a prime.

It is not a weakly prime, because it can be changed into another prime (55385327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27692660 + 27692661.

It is an arithmetic number, because the mean of its divisors is an integer number (27692661).

Almost surely, 2^55385321 is an apocalyptic number.

It is an amenable number.

55385321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55385321 is an equidigital number, since it uses as much as digits as its factorization.

55385321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 32.

The square root of 55385321 is about 7442.1314823107. The cubic root of 55385321 is about 381.1812755816.

The spelling of 55385321 in words is "fifty-five million, three hundred eighty-five thousand, three hundred twenty-one".