216552877 has 2 divisors, whose sum is σ = 216552878. Its totient is φ = 216552876.

The previous prime is 216552863. The next prime is 216552943. The reversal of 216552877 is 778255612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132848676 + 83704201 = 11526^2 + 9149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216552877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216552827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108276438 + 108276439.

It is an arithmetic number, because the mean of its divisors is an integer number (108276439).

Almost surely, 2^216552877 is an apocalyptic number.

It is an amenable number.

216552877 is a deficient number, since it is larger than the sum of its proper divisors (1).

216552877 is an equidigital number, since it uses as much as digits as its factorization.

216552877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235200, while the sum is 43.

The square root of 216552877 is about 14715.7356934677. The cubic root of 216552877 is about 600.5114869927.

The spelling of 216552877 in words is "two hundred sixteen million, five hundred fifty-two thousand, eight hundred seventy-seven".