211152409 has 8 divisors (see below), whose sum is σ = 229521600. Its totient is φ = 193087056.

The previous prime is 211152407. The next prime is 211152457. The reversal of 211152409 is 904251112.

It is a happy number.

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 211152409 - 2¹ = 211152407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211152407) 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, 74509 + ... + 77290.

It is an arithmetic number, because the mean of its divisors is an integer number (28690200).

Almost surely, 2^211152409 is an apocalyptic number.

It is an amenable number.

211152409 is a deficient number, since it is larger than the sum of its proper divisors (18369191).

211152409 is a wasteful number, since it uses less digits than its factorization.

211152409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151919.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 211152409 is about 14531.0842334631. The cubic root of 211152409 is about 595.4774869216.

The spelling of 211152409 in words is "two hundred eleven million, one hundred fifty-two thousand, four hundred nine".