211071745 has 16 divisors (see below), whose sum is σ = 269170128. Its totient is φ = 158341120.

The previous prime is 211071743. The next prime is 211071767. The reversal of 211071745 is 547170112.

It can be written as a sum of positive squares in 8 ways, for example, as 57410929 + 153660816 = 7577^2 + 12396^2 .

It is not a de Polignac number, because 211071745 - 2¹ = 211071743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211071743) 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, 19467 + ... + 28303.

It is an arithmetic number, because the mean of its divisors is an integer number (16823133).

Almost surely, 2^211071745 is an apocalyptic number.

It is an amenable number.

211071745 is a deficient number, since it is larger than the sum of its proper divisors (58098383).

211071745 is a wasteful number, since it uses less digits than its factorization.

211071745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9140.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 211071745 is about 14528.3084011870. The cubic root of 211071745 is about 595.4016495772.

The spelling of 211071745 in words is "two hundred eleven million, seventy-one thousand, seven hundred forty-five".