211611145 has 16 divisors (see below), whose sum is σ = 257148432. Its totient is φ = 167157760.

The previous prime is 211611137. The next prime is 211611157. The reversal of 211611145 is 541116112.

It is a happy number.

211611145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 26759929 + 184851216 = 5173^2 + 13596^2 .

It is not a de Polignac number, because 211611145 - 2³ = 211611137 is a prime.

It is a super-2 number, since 2×211611145² = 89558553376422050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198915 + ... + 199975.

It is an arithmetic number, because the mean of its divisors is an integer number (16071777).

Almost surely, 2^211611145 is an apocalyptic number.

It is an amenable number.

211611145 is a deficient number, since it is larger than the sum of its proper divisors (45537287).

211611145 is a wasteful number, since it uses less digits than its factorization.

211611145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532.

The product of its digits is 240, while the sum is 22.

The square root of 211611145 is about 14546.8603141709. The cubic root of 211611145 is about 595.9084069043.

Adding to 211611145 its reverse (541116112), we get a palindrome (752727257).

The spelling of 211611145 in words is "two hundred eleven million, six hundred eleven thousand, one hundred forty-five".