211053551 has 4 divisors (see below), whose sum is σ = 214203672. Its totient is φ = 207903432.

The previous prime is 211053533. The next prime is 211053559. The reversal of 211053551 is 155350112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211053551 - 2¹⁸ = 210791407 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 (211053559) 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 3 ways as a sum of consecutive naturals, for example, 1574960 + ... + 1575093.

It is an arithmetic number, because the mean of its divisors is an integer number (53550918).

Almost surely, 2^211053551 is an apocalyptic number.

211053551 is a deficient number, since it is larger than the sum of its proper divisors (3150121).

211053551 is an equidigital number, since it uses as much as digits as its factorization.

211053551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3150120.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 211053551 is about 14527.6822308309. The cubic root of 211053551 is about 595.3845415731.

The spelling of 211053551 in words is "two hundred eleven million, fifty-three thousand, five hundred fifty-one".