211504145 has 8 divisors (see below), whose sum is σ = 256134120. Its totient is φ = 167650560.

The previous prime is 211504133. The next prime is 211504147. The reversal of 211504145 is 541405112.

It can be written as a sum of positive squares in 4 ways, for example, as 208849 + 211295296 = 457^2 + 14536^2 .

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

It is not a de Polignac number, because 211504145 - 2⁴ = 211504129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211504145.

It is not an unprimeable number, because it can be changed into a prime (211504147) 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, 193496 + ... + 194585.

It is an arithmetic number, because the mean of its divisors is an integer number (32016765).

Almost surely, 2^211504145 is an apocalyptic number.

It is an amenable number.

211504145 is a deficient number, since it is larger than the sum of its proper divisors (44629975).

211504145 is a wasteful number, since it uses less digits than its factorization.

211504145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388195.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 211504145 is about 14543.1820795863. The cubic root of 211504145 is about 595.8079507121.

Adding to 211504145 its reverse (541405112), we get a palindrome (752909257).

The spelling of 211504145 in words is "two hundred eleven million, five hundred four thousand, one hundred forty-five".