215116553 has 2 divisors, whose sum is σ = 215116554. Its totient is φ = 215116552.

The previous prime is 215116549. The next prime is 215116579. The reversal of 215116553 is 355611512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176278729 + 38837824 = 13277^2 + 6232^2 .

It is a cyclic number.

It is not a de Polignac number, because 215116553 - 2² = 215116549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (215116513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107558276 + 107558277.

It is an arithmetic number, because the mean of its divisors is an integer number (107558277).

Almost surely, 2^215116553 is an apocalyptic number.

It is an amenable number.

215116553 is a deficient number, since it is larger than the sum of its proper divisors (1).

215116553 is an equidigital number, since it uses as much as digits as its factorization.

215116553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4500, while the sum is 29.

The square root of 215116553 is about 14666.8521844328. The cubic root of 215116553 is about 599.1808757532.

The spelling of 215116553 in words is "two hundred fifteen million, one hundred sixteen thousand, five hundred fifty-three".