216887707 has 2 divisors, whose sum is σ = 216887708. Its totient is φ = 216887706.

The previous prime is 216887651. The next prime is 216887711. The reversal of 216887707 is 707788612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216887707 - 2⁷ = 216887579 is a prime.

It is not a weakly prime, because it can be changed into another prime (216885707) 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, 108443853 + 108443854.

It is an arithmetic number, because the mean of its divisors is an integer number (108443854).

Almost surely, 2^216887707 is an apocalyptic number.

216887707 is a deficient number, since it is larger than the sum of its proper divisors (1).

216887707 is an equidigital number, since it uses as much as digits as its factorization.

216887707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 263424, while the sum is 46.

The square root of 216887707 is about 14727.1078966646. The cubic root of 216887707 is about 600.8208274843.

The spelling of 216887707 in words is "two hundred sixteen million, eight hundred eighty-seven thousand, seven hundred seven".