216415351 has 2 divisors, whose sum is σ = 216415352. Its totient is φ = 216415350.

The previous prime is 216415319. The next prime is 216415357. The reversal of 216415351 is 153514612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216415351 - 2⁵ = 216415319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216415357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108207675 + 108207676.

It is an arithmetic number, because the mean of its divisors is an integer number (108207676).

Almost surely, 2^216415351 is an apocalyptic number.

216415351 is a deficient number, since it is larger than the sum of its proper divisors (1).

216415351 is an equidigital number, since it uses as much as digits as its factorization.

216415351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 216415351 is about 14711.0621982235. The cubic root of 216415351 is about 600.3843380138.

Adding to 216415351 its reverse (153514612), we get a palindrome (369929963).

The spelling of 216415351 in words is "two hundred sixteen million, four hundred fifteen thousand, three hundred fifty-one".