216553853 has 2 divisors, whose sum is σ = 216553854. Its totient is φ = 216553852.

The previous prime is 216553829. The next prime is 216553861. The reversal of 216553853 is 358355612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204289849 + 12264004 = 14293^2 + 3502^2 .

It is a cyclic number.

It is not a de Polignac number, because 216553853 - 2⁶ = 216553789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216553153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108276926 + 108276927.

It is an arithmetic number, because the mean of its divisors is an integer number (108276927).

Almost surely, 2^216553853 is an apocalyptic number.

It is an amenable number.

216553853 is a deficient number, since it is larger than the sum of its proper divisors (1).

216553853 is an equidigital number, since it uses as much as digits as its factorization.

216553853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The square root of 216553853 is about 14715.7688552111. The cubic root of 216553853 is about 600.5123891562.

The spelling of 216553853 in words is "two hundred sixteen million, five hundred fifty-three thousand, eight hundred fifty-three".