55815211 has 2 divisors, whose sum is σ = 55815212. Its totient is φ = 55815210.

The previous prime is 55815191. The next prime is 55815281. The reversal of 55815211 is 11251855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55815211 - 2⁹ = 55814699 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55815211.

It is not a weakly prime, because it can be changed into another prime (55815281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27907605 + 27907606.

It is an arithmetic number, because the mean of its divisors is an integer number (27907606).

Almost surely, 2^55815211 is an apocalyptic number.

55815211 is a deficient number, since it is larger than the sum of its proper divisors (1).

55815211 is an equidigital number, since it uses as much as digits as its factorization.

55815211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 28.

The square root of 55815211 is about 7470.9578368506. The cubic root of 55815211 is about 382.1649530199.

The spelling of 55815211 in words is "fifty-five million, eight hundred fifteen thousand, two hundred eleven".