215488517 has 2 divisors, whose sum is σ = 215488518. Its totient is φ = 215488516.

The previous prime is 215488489. The next prime is 215488571. The reversal of 215488517 is 715884512.

Together with next prime (215488571) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207388801 + 8099716 = 14401^2 + 2846^2 .

It is a cyclic number.

It is not a de Polignac number, because 215488517 - 2¹² = 215484421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215488577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107744258 + 107744259.

It is an arithmetic number, because the mean of its divisors is an integer number (107744259).

Almost surely, 2^215488517 is an apocalyptic number.

It is an amenable number.

215488517 is a deficient number, since it is larger than the sum of its proper divisors (1).

215488517 is an equidigital number, since it uses as much as digits as its factorization.

215488517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 41.

The square root of 215488517 is about 14679.5271381608. The cubic root of 215488517 is about 599.5260303161.

The spelling of 215488517 in words is "two hundred fifteen million, four hundred eighty-eight thousand, five hundred seventeen".