215284961 has 8 divisors (see below), whose sum is σ = 221263680. Its totient is φ = 209350512.

The previous prime is 215284943. The next prime is 215285011. The reversal of 215284961 is 169482512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215284961 - 2⁶ = 215284897 is a prime.

It is a super-2 number, since 2×215284961² = 92695228865543042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215284061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085 + ... + 20778.

It is an arithmetic number, because the mean of its divisors is an integer number (27657960).

Almost surely, 2^215284961 is an apocalyptic number.

It is an amenable number.

215284961 is a deficient number, since it is larger than the sum of its proper divisors (5978719).

215284961 is a wasteful number, since it uses less digits than its factorization.

215284961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22135.

The product of its digits is 34560, while the sum is 38.

The square root of 215284961 is about 14672.5921704381. The cubic root of 215284961 is about 599.3371949372.

The spelling of 215284961 in words is "two hundred fifteen million, two hundred eighty-four thousand, nine hundred sixty-one".