211965493 has 4 divisors (see below), whose sum is σ = 221181408. Its totient is φ = 202749580.

The previous prime is 211965487. The next prime is 211965511. The reversal of 211965493 is 394569112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211965493 - 2²¹ = 209868341 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211465493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4607923 + ... + 4607968.

It is an arithmetic number, because the mean of its divisors is an integer number (55295352).

Almost surely, 2^211965493 is an apocalyptic number.

211965493 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

211965493 is a deficient number, since it is larger than the sum of its proper divisors (9215915).

211965493 is an equidigital number, since it uses as much as digits as its factorization.

211965493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9215914.

The product of its digits is 58320, while the sum is 40.

The square root of 211965493 is about 14559.0347550928. The cubic root of 211965493 is about 596.2408424479.

The spelling of 211965493 in words is "two hundred eleven million, nine hundred sixty-five thousand, four hundred ninety-three".