215831330887 has 2 divisors, whose sum is σ = 215831330888. Its totient is φ = 215831330886.

The previous prime is 215831330873. The next prime is 215831330917. The reversal of 215831330887 is 788033138512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215831330887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215831330887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215831330867) 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, 107915665443 + 107915665444.

It is an arithmetic number, because the mean of its divisors is an integer number (107915665444).

Almost surely, 2^215831330887 is an apocalyptic number.

215831330887 is a deficient number, since it is larger than the sum of its proper divisors (1).

215831330887 is an equidigital number, since it uses as much as digits as its factorization.

215831330887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 215831330887 in words is "two hundred fifteen billion, eight hundred thirty-one million, three hundred thirty thousand, eight hundred eighty-seven".