55215361 has 2 divisors, whose sum is σ = 55215362. Its totient is φ = 55215360.

The previous prime is 55215343. The next prime is 55215379. The reversal of 55215361 is 16351255.

It is a balanced prime because it is at equal distance from previous prime (55215343) and next prime (55215379).

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 20875761 = 5860^2 + 4569^2 .

It is a cyclic number.

It is not a de Polignac number, because 55215361 - 2¹¹ = 55213313 is a prime.

It is not a weakly prime, because it can be changed into another prime (55215331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27607680 + 27607681.

It is an arithmetic number, because the mean of its divisors is an integer number (27607681).

Almost surely, 2^55215361 is an apocalyptic number.

It is an amenable number.

55215361 is a deficient number, since it is larger than the sum of its proper divisors (1).

55215361 is an equidigital number, since it uses as much as digits as its factorization.

55215361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 28.

The square root of 55215361 is about 7430.7039370439. The cubic root of 55215361 is about 380.7909678826.

The spelling of 55215361 in words is "fifty-five million, two hundred fifteen thousand, three hundred sixty-one".