216959497 has 2 divisors, whose sum is σ = 216959498. Its totient is φ = 216959496.

The previous prime is 216959471. The next prime is 216959549. The reversal of 216959497 is 794959612.

It is an a-pointer prime, because the next prime (216959549) can be obtained adding 216959497 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145540096 + 71419401 = 12064^2 + 8451^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216959497 is a prime.

It is not a weakly prime, because it can be changed into another prime (216959417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108479748 + 108479749.

It is an arithmetic number, because the mean of its divisors is an integer number (108479749).

Almost surely, 2^216959497 is an apocalyptic number.

It is an amenable number.

216959497 is a deficient number, since it is larger than the sum of its proper divisors (1).

216959497 is an equidigital number, since it uses as much as digits as its factorization.

216959497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 52.

The square root of 216959497 is about 14729.5450371015. The cubic root of 216959497 is about 600.8871108922.

The spelling of 216959497 in words is "two hundred sixteen million, nine hundred fifty-nine thousand, four hundred ninety-seven".