55310921 has 2 divisors, whose sum is σ = 55310922. Its totient is φ = 55310920.

The previous prime is 55310903. The next prime is 55310939. The reversal of 55310921 is 12901355.

It is a balanced prime because it is at equal distance from previous prime (55310903) and next prime (55310939).

It can be written as a sum of positive squares in only one way, i.e., 51998521 + 3312400 = 7211^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 55310921 - 2¹⁴ = 55294537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55310971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27655460 + 27655461.

It is an arithmetic number, because the mean of its divisors is an integer number (27655461).

Almost surely, 2^55310921 is an apocalyptic number.

It is an amenable number.

55310921 is a deficient number, since it is larger than the sum of its proper divisors (1).

55310921 is an equidigital number, since it uses as much as digits as its factorization.

55310921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 55310921 is about 7437.1312345554. The cubic root of 55310921 is about 381.0105167678.

The spelling of 55310921 in words is "fifty-five million, three hundred ten thousand, nine hundred twenty-one".