216870877 has 2 divisors, whose sum is σ = 216870878. Its totient is φ = 216870876.

The previous prime is 216870847. The next prime is 216870911. The reversal of 216870877 is 778078612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172501956 + 44368921 = 13134^2 + 6661^2 .

It is a cyclic number.

It is not a de Polignac number, because 216870877 - 2¹⁵ = 216838109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216870817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108435438 + 108435439.

It is an arithmetic number, because the mean of its divisors is an integer number (108435439).

Almost surely, 2^216870877 is an apocalyptic number.

It is an amenable number.

216870877 is a deficient number, since it is larger than the sum of its proper divisors (1).

216870877 is an equidigital number, since it uses as much as digits as its factorization.

216870877 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 216870877 is about 14726.5364902953. The cubic root of 216870877 is about 600.8052862990.

The spelling of 216870877 in words is "two hundred sixteen million, eight hundred seventy thousand, eight hundred seventy-seven".