211638093 has 8 divisors (see below), whose sum is σ = 297036000. Its totient is φ = 133666128.

The previous prime is 211638073. The next prime is 211638101. The reversal of 211638093 is 390836112.

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

It is not a de Polignac number, because 211638093 - 2⁵ = 211638061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211638013) 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, 1856418 + ... + 1856531.

It is an arithmetic number, because the mean of its divisors is an integer number (37129500).

Almost surely, 2^211638093 is an apocalyptic number.

It is an amenable number.

211638093 is a deficient number, since it is larger than the sum of its proper divisors (85397907).

211638093 is a wasteful number, since it uses less digits than its factorization.

211638093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3712971.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 211638093 is about 14547.7865326654. The cubic root of 211638093 is about 595.9337015048.

The spelling of 211638093 in words is "two hundred eleven million, six hundred thirty-eight thousand, ninety-three".