216246551 has 2 divisors, whose sum is σ = 216246552. Its totient is φ = 216246550.

The previous prime is 216246523. The next prime is 216246553. The reversal of 216246551 is 155642612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216246551 - 2⁶ = 216246487 is a prime.

Together with 216246553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216246553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108123275 + 108123276.

It is an arithmetic number, because the mean of its divisors is an integer number (108123276).

Almost surely, 2^216246551 is an apocalyptic number.

216246551 is a deficient number, since it is larger than the sum of its proper divisors (1).

216246551 is an equidigital number, since it uses as much as digits as its factorization.

216246551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 216246551 is about 14705.3238998670. The cubic root of 216246551 is about 600.2282011590.

The spelling of 216246551 in words is "two hundred sixteen million, two hundred forty-six thousand, five hundred fifty-one".