216215461 has 16 divisors (see below), whose sum is σ = 274658688. Its totient is φ = 165297600.

The previous prime is 216215449. The next prime is 216215477. The reversal of 216215461 is 164512612.

It is a cyclic number.

It is not a de Polignac number, because 216215461 - 2⁵ = 216215429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216215411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22410 + ... + 30571.

It is an arithmetic number, because the mean of its divisors is an integer number (17166168).

Almost surely, 2^216215461 is an apocalyptic number.

It is an amenable number.

216215461 is a deficient number, since it is larger than the sum of its proper divisors (58443227).

216215461 is a wasteful number, since it uses less digits than its factorization.

216215461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53052.

The product of its digits is 2880, while the sum is 28.

The square root of 216215461 is about 14704.2667617260. The cubic root of 216215461 is about 600.1994346283.

The spelling of 216215461 in words is "two hundred sixteen million, two hundred fifteen thousand, four hundred sixty-one".