216251145 has 24 divisors (see below), whose sum is σ = 408912192. Its totient is φ = 104848800.

The previous prime is 216251117. The next prime is 216251149. The reversal of 216251145 is 541152612.

216251145 is a `hidden beast` number, since 21 + 625 + 1 + 14 + 5 = 666.

It is not a de Polignac number, because 216251145 - 2¹⁰ = 216250121 is a prime.

It is a super-2 number, since 2×216251145² = 93529115427622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216251149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217941 + ... + 218930.

It is an arithmetic number, because the mean of its divisors is an integer number (17038008).

Almost surely, 2^216251145 is an apocalyptic number.

It is an amenable number.

216251145 is a deficient number, since it is larger than the sum of its proper divisors (192661047).

216251145 is a wasteful number, since it uses less digits than its factorization.

216251145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436893 (or 436890 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 216251145 is about 14705.4801009692. The cubic root of 216251145 is about 600.2324515988.

The spelling of 216251145 in words is "two hundred sixteen million, two hundred fifty-one thousand, one hundred forty-five".