216341977 has 2 divisors, whose sum is σ = 216341978. Its totient is φ = 216341976.

The previous prime is 216341969. The next prime is 216342011. The reversal of 216341977 is 779143612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201100761 + 15241216 = 14181^2 + 3904^2 .

It is a cyclic number.

It is not a de Polignac number, because 216341977 - 2³ = 216341969 is a prime.

It is not a weakly prime, because it can be changed into another prime (216341927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108170988 + 108170989.

It is an arithmetic number, because the mean of its divisors is an integer number (108170989).

Almost surely, 2^216341977 is an apocalyptic number.

It is an amenable number.

216341977 is a deficient number, since it is larger than the sum of its proper divisors (1).

216341977 is an equidigital number, since it uses as much as digits as its factorization.

216341977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 216341977 is about 14708.5681492115. The cubic root of 216341977 is about 600.3164784100.

The spelling of 216341977 in words is "two hundred sixteen million, three hundred forty-one thousand, nine hundred seventy-seven".