216061913 has 2 divisors, whose sum is σ = 216061914. Its totient is φ = 216061912.

The previous prime is 216061897. The next prime is 216061921. The reversal of 216061913 is 319160612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159466384 + 56595529 = 12628^2 + 7523^2 .

It is a cyclic number.

It is not a de Polignac number, because 216061913 - 2⁴ = 216061897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (216061213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108030956 + 108030957.

It is an arithmetic number, because the mean of its divisors is an integer number (108030957).

Almost surely, 2^216061913 is an apocalyptic number.

It is an amenable number.

216061913 is a deficient number, since it is larger than the sum of its proper divisors (1).

216061913 is an equidigital number, since it uses as much as digits as its factorization.

216061913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 216061913 is about 14699.0446288186. The cubic root of 216061913 is about 600.0573213754.

The spelling of 216061913 in words is "two hundred sixteen million, sixty-one thousand, nine hundred thirteen".