215240653 has 2 divisors, whose sum is σ = 215240654. Its totient is φ = 215240652.

The previous prime is 215240651. The next prime is 215240659. The reversal of 215240653 is 356042512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186650244 + 28590409 = 13662^2 + 5347^2 .

It is a cyclic number.

It is not a de Polignac number, because 215240653 - 2¹ = 215240651 is a prime.

Together with 215240651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215240651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107620326 + 107620327.

It is an arithmetic number, because the mean of its divisors is an integer number (107620327).

Almost surely, 2^215240653 is an apocalyptic number.

It is an amenable number.

215240653 is a deficient number, since it is larger than the sum of its proper divisors (1).

215240653 is an equidigital number, since it uses as much as digits as its factorization.

215240653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 215240653 is about 14671.0822027552. The cubic root of 215240653 is about 599.2960753992.

The spelling of 215240653 in words is "two hundred fifteen million, two hundred forty thousand, six hundred fifty-three".