55169321 has 2 divisors, whose sum is σ = 55169322. Its totient is φ = 55169320.

The previous prime is 55169299. The next prime is 55169327. The reversal of 55169321 is 12396155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 1073296 = 7355^2 + 1036^2 .

It is a cyclic number.

It is not a de Polignac number, because 55169321 - 2¹⁰ = 55168297 is a prime.

It is not a weakly prime, because it can be changed into another prime (55169327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27584660 + 27584661.

It is an arithmetic number, because the mean of its divisors is an integer number (27584661).

Almost surely, 2^55169321 is an apocalyptic number.

It is an amenable number.

55169321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55169321 is an equidigital number, since it uses as much as digits as its factorization.

55169321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 55169321 is about 7427.6053341572. The cubic root of 55169321 is about 380.6851006573.

The spelling of 55169321 in words is "fifty-five million, one hundred sixty-nine thousand, three hundred twenty-one".