215205113987 has 2 divisors, whose sum is σ = 215205113988. Its totient is φ = 215205113986.

The previous prime is 215205113983. The next prime is 215205114023. The reversal of 215205113987 is 789311502512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215205113987 - 2² = 215205113983 is a prime.

It is not a weakly prime, because it can be changed into another prime (215205113983) 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, 107602556993 + 107602556994.

It is an arithmetic number, because the mean of its divisors is an integer number (107602556994).

Almost surely, 2^215205113987 is an apocalyptic number.

215205113987 is a deficient number, since it is larger than the sum of its proper divisors (1).

215205113987 is an equidigital number, since it uses as much as digits as its factorization.

215205113987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 44.

The spelling of 215205113987 in words is "two hundred fifteen billion, two hundred five million, one hundred thirteen thousand, nine hundred eighty-seven".