212647117 has 4 divisors (see below), whose sum is σ = 214752636. Its totient is φ = 210541600.

The previous prime is 212647091. The next prime is 212647133. The reversal of 212647117 is 711746212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210424036 + 2223081 = 14506^2 + 1491^2 .

It is a cyclic number.

It is not a de Polignac number, because 212647117 - 2¹⁵ = 212614349 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 (212647147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052608 + ... + 1052809.

It is an arithmetic number, because the mean of its divisors is an integer number (53688159).

Almost surely, 2^212647117 is an apocalyptic number.

It is an amenable number.

212647117 is a deficient number, since it is larger than the sum of its proper divisors (2105519).

212647117 is a wasteful number, since it uses less digits than its factorization.

212647117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2105518.

The product of its digits is 4704, while the sum is 31.

The square root of 212647117 is about 14582.4249355174. The cubic root of 212647117 is about 596.8792753072.

The spelling of 212647117 in words is "two hundred twelve million, six hundred forty-seven thousand, one hundred seventeen".