216201977 has 2 divisors, whose sum is σ = 216201978. Its totient is φ = 216201976.

The previous prime is 216201961. The next prime is 216202009. The reversal of 216201977 is 779102612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216060601 + 141376 = 14699^2 + 376^2 .

It is a cyclic number.

It is not a de Polignac number, because 216201977 - 2⁴ = 216201961 is a prime.

It is not a weakly prime, because it can be changed into another prime (216201917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108100988 + 108100989.

It is an arithmetic number, because the mean of its divisors is an integer number (108100989).

Almost surely, 2^216201977 is an apocalyptic number.

It is an amenable number.

216201977 is a deficient number, since it is larger than the sum of its proper divisors (1).

216201977 is an equidigital number, since it uses as much as digits as its factorization.

216201977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 216201977 is about 14703.8082482056. The cubic root of 216201977 is about 600.1869574795.

The spelling of 216201977 in words is "two hundred sixteen million, two hundred one thousand, nine hundred seventy-seven".