215043531210581 has 2 divisors, whose sum is σ = 215043531210582. Its totient is φ = 215043531210580.

The previous prime is 215043531210523. The next prime is 215043531210649. The reversal of 215043531210581 is 185012135340512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135218151615556 + 79825379595025 = 11628334^2 + 8934505^2 .

It is a cyclic number.

It is not a de Polignac number, because 215043531210581 - 2²⁶ = 215043464101717 is a prime.

It is a super-2 number, since 2×215043531210581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215043531210281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107521765605290 + 107521765605291.

It is an arithmetic number, because the mean of its divisors is an integer number (107521765605291).

Almost surely, 2^{215043531210581} is an apocalyptic number.

It is an amenable number.

215043531210581 is a deficient number, since it is larger than the sum of its proper divisors (1).

215043531210581 is an equidigital number, since it uses as much as digits as its factorization.

215043531210581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 41.

The spelling of 215043531210581 in words is "two hundred fifteen trillion, forty-three billion, five hundred thirty-one million, two hundred ten thousand, five hundred eighty-one".