216122461 has 2 divisors, whose sum is σ = 216122462. Its totient is φ = 216122460.

The previous prime is 216122443. The next prime is 216122519. The reversal of 216122461 is 164221612.

It is a happy number.

216122461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130096836 + 86025625 = 11406^2 + 9275^2 .

It is a cyclic number.

It is not a de Polignac number, because 216122461 - 2¹⁵ = 216089693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216122441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108061230 + 108061231.

It is an arithmetic number, because the mean of its divisors is an integer number (108061231).

Almost surely, 2^216122461 is an apocalyptic number.

It is an amenable number.

216122461 is a deficient number, since it is larger than the sum of its proper divisors (1).

216122461 is an equidigital number, since it uses as much as digits as its factorization.

216122461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 216122461 is about 14701.1040741844. The cubic root of 216122461 is about 600.1133683928.

The spelling of 216122461 in words is "two hundred sixteen million, one hundred twenty-two thousand, four hundred sixty-one".