216456361 has 4 divisors (see below), whose sum is σ = 236134224. Its totient is φ = 196778500.

The previous prime is 216456349. The next prime is 216456419. The reversal of 216456361 is 163654612.

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 216456361 - 2¹⁵ = 216423593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216456061) 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, 9838915 + ... + 9838936.

It is an arithmetic number, because the mean of its divisors is an integer number (59033556).

Almost surely, 2^216456361 is an apocalyptic number.

It is an amenable number.

216456361 is a deficient number, since it is larger than the sum of its proper divisors (19677863).

216456361 is a wasteful number, since it uses less digits than its factorization.

216456361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19677862.

The product of its digits is 25920, while the sum is 34.

The square root of 216456361 is about 14712.4559812426. The cubic root of 216456361 is about 600.4222592403.

The spelling of 216456361 in words is "two hundred sixteen million, four hundred fifty-six thousand, three hundred sixty-one".