211061864 has 16 divisors (see below), whose sum is σ = 426182820. Its totient is φ = 97413120.

The previous prime is 211061849. The next prime is 211061881. The reversal of 211061864 is 468160112.

It can be written as a sum of positive squares in 2 ways, for example, as 160224964 + 50836900 = 12658^2 + 7130^2 .

It is a super-2 number, since 2×211061864² = 89094220870308992, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1014617 + ... + 1014824.

Almost surely, 2^211061864 is an apocalyptic number.

It is an amenable number.

211061864 is an abundant number, since it is smaller than the sum of its proper divisors (215120956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211061864 is a wasteful number, since it uses less digits than its factorization.

211061864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029460 (or 2029456 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 211061864 is about 14527.9683369699. The cubic root of 211061864 is about 595.3923584939.

The spelling of 211061864 in words is "two hundred eleven million, sixty-one thousand, eight hundred sixty-four".