212552409 has 8 divisors (see below), whose sum is σ = 285208960. Its totient is φ = 140798736.

The previous prime is 212552401. The next prime is 212552437. The reversal of 212552409 is 904255212.

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

It is not a de Polignac number, because 212552409 - 2³ = 212552401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212552401) 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, 225169 + ... + 226110.

It is an arithmetic number, because the mean of its divisors is an integer number (35651120).

Almost surely, 2^212552409 is an apocalyptic number.

It is an amenable number.

212552409 is a deficient number, since it is larger than the sum of its proper divisors (72656551).

212552409 is a wasteful number, since it uses less digits than its factorization.

212552409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451439.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 212552409 is about 14579.1772401600. The cubic root of 212552409 is about 596.7906501747.

The spelling of 212552409 in words is "two hundred twelve million, five hundred fifty-two thousand, four hundred nine".