211855461 has 16 divisors (see below), whose sum is σ = 301031424. Its totient is φ = 132219824.

The previous prime is 211855459. The next prime is 211855493. The reversal of 211855461 is 164558112.

It is not a de Polignac number, because 211855461 - 2¹ = 211855459 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211855261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29421 + ... + 35906.

It is an arithmetic number, because the mean of its divisors is an integer number (18814464).

Almost surely, 2^211855461 is an apocalyptic number.

It is an amenable number.

211855461 is a deficient number, since it is larger than the sum of its proper divisors (89175963).

211855461 is a wasteful number, since it uses less digits than its factorization.

211855461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65400.

The product of its digits is 9600, while the sum is 33.

The square root of 211855461 is about 14555.2554426228. The cubic root of 211855461 is about 596.1376543822.

The spelling of 211855461 in words is "two hundred eleven million, eight hundred fifty-five thousand, four hundred sixty-one".