212652661 has 8 divisors (see below), whose sum is σ = 229796280. Its totient is φ = 195621312.

The previous prime is 212652647. The next prime is 212652689. The reversal of 212652661 is 166256212.

It can be written as a sum of positive squares in 4 ways, for example, as 38254225 + 174398436 = 6185^2 + 13206^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212652661 - 2⁷ = 212652533 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 (212652361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24106 + ... + 31723.

It is an arithmetic number, because the mean of its divisors is an integer number (28724535).

Almost surely, 2^212652661 is an apocalyptic number.

It is an amenable number.

212652661 is a deficient number, since it is larger than the sum of its proper divisors (17143619).

212652661 is a wasteful number, since it uses less digits than its factorization.

212652661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56135.

The product of its digits is 8640, while the sum is 31.

The square root of 212652661 is about 14582.6150261193. The cubic root of 212652661 is about 596.8844624141.

The spelling of 212652661 in words is "two hundred twelve million, six hundred fifty-two thousand, six hundred sixty-one".