216774433 has 2 divisors, whose sum is σ = 216774434. Its totient is φ = 216774432.

The previous prime is 216774409. The next prime is 216774443. The reversal of 216774433 is 334477612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138133009 + 78641424 = 11753^2 + 8868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216774433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216774392 and 216774401.

It is not a weakly prime, because it can be changed into another prime (216774443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108387216 + 108387217.

It is an arithmetic number, because the mean of its divisors is an integer number (108387217).

Almost surely, 2^216774433 is an apocalyptic number.

It is an amenable number.

216774433 is a deficient number, since it is larger than the sum of its proper divisors (1).

216774433 is an equidigital number, since it uses as much as digits as its factorization.

216774433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 37.

The square root of 216774433 is about 14723.2616291364. The cubic root of 216774433 is about 600.7162123189.

The spelling of 216774433 in words is "two hundred sixteen million, seven hundred seventy-four thousand, four hundred thirty-three".