216597133 has 2 divisors, whose sum is σ = 216597134. Its totient is φ = 216597132.

The previous prime is 216597127. The next prime is 216597191. The reversal of 216597133 is 331795612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200420649 + 16176484 = 14157^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 216597133 - 2²¹ = 214499981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216597092 and 216597101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216597113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108298566 + 108298567.

It is an arithmetic number, because the mean of its divisors is an integer number (108298567).

Almost surely, 2^216597133 is an apocalyptic number.

It is an amenable number.

216597133 is a deficient number, since it is larger than the sum of its proper divisors (1).

216597133 is an equidigital number, since it uses as much as digits as its factorization.

216597133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 216597133 is about 14717.2393131321. The cubic root of 216597133 is about 600.5523922079.

It can be divided in two parts, 21659713 and 3, that added together give a square (21659716 = 4654²).

The spelling of 216597133 in words is "two hundred sixteen million, five hundred ninety-seven thousand, one hundred thirty-three".