211406193 has 10 divisors (see below), whose sum is σ = 315804434. Its totient is φ = 140937408.

The previous prime is 211406177. The next prime is 211406219. The reversal of 211406193 is 391604112.

211406193 is a `hidden beast` number, since 2 + 1 + 1 + 40 + 619 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 204261264 + 7144929 = 14292^2 + 2673^2 .

It is not a de Polignac number, because 211406193 - 2⁴ = 211406177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211406093) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1304896 + ... + 1305057.

Almost surely, 2^211406193 is an apocalyptic number.

It is an amenable number.

211406193 is a deficient number, since it is larger than the sum of its proper divisors (104398241).

211406193 is an equidigital number, since it uses as much as digits as its factorization.

211406193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609965 (or 2609956 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 211406193 is about 14539.8140634604. The cubic root of 211406193 is about 595.7159594621.

The spelling of 211406193 in words is "two hundred eleven million, four hundred six thousand, one hundred ninety-three".