55328929 has 2 divisors, whose sum is σ = 55328930. Its totient is φ = 55328928.

The previous prime is 55328927. The next prime is 55328971. The reversal of 55328929 is 92982355.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29593600 + 25735329 = 5440^2 + 5073^2 .

It is a cyclic number.

It is not a de Polignac number, because 55328929 - 2¹ = 55328927 is a prime.

It is a super-2 number, since 2×55328929² = 6122580768574082, which contains 22 as substring.

Together with 55328927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55328921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27664464 + 27664465.

It is an arithmetic number, because the mean of its divisors is an integer number (27664465).

Almost surely, 2^55328929 is an apocalyptic number.

It is an amenable number.

55328929 is a deficient number, since it is larger than the sum of its proper divisors (1).

55328929 is an equidigital number, since it uses as much as digits as its factorization.

55328929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 55328929 is about 7438.3418179054. The cubic root of 55328929 is about 381.0518617847.

The spelling of 55328929 in words is "fifty-five million, three hundred twenty-eight thousand, nine hundred twenty-nine".