216354401 has 2 divisors, whose sum is σ = 216354402. Its totient is φ = 216354400.

The previous prime is 216354367. The next prime is 216354403. The reversal of 216354401 is 104453612.

216354401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133980625 + 82373776 = 11575^2 + 9076^2 .

It is a cyclic number.

It is not a de Polignac number, because 216354401 - 2²² = 212160097 is a prime.

Together with 216354403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216354403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108177200 + 108177201.

It is an arithmetic number, because the mean of its divisors is an integer number (108177201).

Almost surely, 2^216354401 is an apocalyptic number.

It is an amenable number.

216354401 is a deficient number, since it is larger than the sum of its proper divisors (1).

216354401 is an equidigital number, since it uses as much as digits as its factorization.

216354401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 216354401 is about 14708.9904820147. The cubic root of 216354401 is about 600.3279697678.

The spelling of 216354401 in words is "two hundred sixteen million, three hundred fifty-four thousand, four hundred one".