216732499 has 2 divisors, whose sum is σ = 216732500. Its totient is φ = 216732498.

The previous prime is 216732491. The next prime is 216732539. The reversal of 216732499 is 994237612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216732499 - 2³ = 216732491 is a prime.

It is a super-2 number, since 2×216732499² = 93945952245570002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216732491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108366249 + 108366250.

It is an arithmetic number, because the mean of its divisors is an integer number (108366250).

Almost surely, 2^216732499 is an apocalyptic number.

216732499 is a deficient number, since it is larger than the sum of its proper divisors (1).

216732499 is an equidigital number, since it uses as much as digits as its factorization.

216732499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 216732499 is about 14721.8374872161. The cubic root of 216732499 is about 600.6774745739.

The spelling of 216732499 in words is "two hundred sixteen million, seven hundred thirty-two thousand, four hundred ninety-nine".