216152261 has 8 divisors (see below), whose sum is σ = 239071224. Its totient is φ = 194132160.

The previous prime is 216152257. The next prime is 216152267. The reversal of 216152261 is 162251612.

It can be written as a sum of positive squares in 4 ways, for example, as 11519236 + 204633025 = 3394^2 + 14305^2 .

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 216152261 - 2² = 216152257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216152261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216152267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224210 + ... + 225171.

It is an arithmetic number, because the mean of its divisors is an integer number (29883903).

Almost surely, 2^216152261 is an apocalyptic number.

It is an amenable number.

216152261 is a deficient number, since it is larger than the sum of its proper divisors (22918963).

216152261 is a wasteful number, since it uses less digits than its factorization.

216152261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449431.

The product of its digits is 1440, while the sum is 26.

The square root of 216152261 is about 14702.1175685681. The cubic root of 216152261 is about 600.1409492936.

The spelling of 216152261 in words is "two hundred sixteen million, one hundred fifty-two thousand, two hundred sixty-one".