216626297 has 4 divisors (see below), whose sum is σ = 216671616. Its totient is φ = 216580980.

The previous prime is 216626281. The next prime is 216626299. The reversal of 216626297 is 792626612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216626297 - 2⁴ = 216626281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216626299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14513 + ... + 25374.

It is an arithmetic number, because the mean of its divisors is an integer number (54167904).

Almost surely, 2^216626297 is an apocalyptic number.

It is an amenable number.

216626297 is a deficient number, since it is larger than the sum of its proper divisors (45319).

216626297 is an equidigital number, since it uses as much as digits as its factorization.

216626297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45318.

The product of its digits is 108864, while the sum is 41.

The square root of 216626297 is about 14718.2300906053. The cubic root of 216626297 is about 600.5793450484.

The spelling of 216626297 in words is "two hundred sixteen million, six hundred twenty-six thousand, two hundred ninety-seven".