215312239993 has 2 divisors, whose sum is σ = 215312239994. Its totient is φ = 215312239992.

The previous prime is 215312239921. The next prime is 215312240023. The reversal of 215312239993 is 399932213512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115523852544 + 99788387449 = 339888^2 + 315893^2 .

It is a cyclic number.

It is not a de Polignac number, because 215312239993 - 2⁹ = 215312239481 is a prime.

It is not a weakly prime, because it can be changed into another prime (215312239393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107656119996 + 107656119997.

It is an arithmetic number, because the mean of its divisors is an integer number (107656119997).

Almost surely, 2^215312239993 is an apocalyptic number.

It is an amenable number.

215312239993 is a deficient number, since it is larger than the sum of its proper divisors (1).

215312239993 is an equidigital number, since it uses as much as digits as its factorization.

215312239993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 49.

The spelling of 215312239993 in words is "two hundred fifteen billion, three hundred twelve million, two hundred thirty-nine thousand, nine hundred ninety-three".