216261245 has 8 divisors (see below), whose sum is σ = 261014616. Its totient is φ = 172008256.

The previous prime is 216261229. The next prime is 216261247. The reversal of 216261245 is 542162612.

It can be written as a sum of positive squares in 4 ways, for example, as 86620249 + 129640996 = 9307^2 + 11386^2 .

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 216261245 - 2⁴ = 216261229 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 (216261247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124142 + ... + 125871.

It is an arithmetic number, because the mean of its divisors is an integer number (32626827).

Almost surely, 2^216261245 is an apocalyptic number.

It is an amenable number.

216261245 is a deficient number, since it is larger than the sum of its proper divisors (44753371).

216261245 is a wasteful number, since it uses less digits than its factorization.

216261245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250191.

The product of its digits is 5760, while the sum is 29.

The square root of 216261245 is about 14705.8235063528. The cubic root of 216261245 is about 600.2417960632.

The spelling of 216261245 in words is "two hundred sixteen million, two hundred sixty-one thousand, two hundred forty-five".