216450929 has 2 divisors, whose sum is σ = 216450930. Its totient is φ = 216450928.

The previous prime is 216450889. The next prime is 216450947. The reversal of 216450929 is 929054612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155251600 + 61199329 = 12460^2 + 7823^2 .

It is a cyclic number.

It is not a de Polignac number, because 216450929 - 2¹² = 216446833 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216450892 and 216450901.

It is not a weakly prime, because it can be changed into another prime (216450989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108225464 + 108225465.

It is an arithmetic number, because the mean of its divisors is an integer number (108225465).

Almost surely, 2^216450929 is an apocalyptic number.

It is an amenable number.

216450929 is a deficient number, since it is larger than the sum of its proper divisors (1).

216450929 is an equidigital number, since it uses as much as digits as its factorization.

216450929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 216450929 is about 14712.2713746043. The cubic root of 216450929 is about 600.4172366406.

The spelling of 216450929 in words is "two hundred sixteen million, four hundred fifty thousand, nine hundred twenty-nine".