216126511 has 2 divisors, whose sum is σ = 216126512. Its totient is φ = 216126510.

The previous prime is 216126503. The next prime is 216126553. The reversal of 216126511 is 115621612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216126511 - 2³ = 216126503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216121511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108063255 + 108063256.

It is an arithmetic number, because the mean of its divisors is an integer number (108063256).

Almost surely, 2^216126511 is an apocalyptic number.

216126511 is a deficient number, since it is larger than the sum of its proper divisors (1).

216126511 is an equidigital number, since it uses as much as digits as its factorization.

216126511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 25.

The square root of 216126511 is about 14701.2418182955. The cubic root of 216126511 is about 600.1171169527.

The spelling of 216126511 in words is "two hundred sixteen million, one hundred twenty-six thousand, five hundred eleven".