212406091 has 4 divisors (see below), whose sum is σ = 212936184. Its totient is φ = 211876000.

The previous prime is 212406071. The next prime is 212406097. The reversal of 212406091 is 190604212.

212406091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 212406091 - 2¹⁵ = 212373323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212406097) 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, 264445 + ... + 265246.

It is an arithmetic number, because the mean of its divisors is an integer number (53234046).

Almost surely, 2^212406091 is an apocalyptic number.

212406091 is a deficient number, since it is larger than the sum of its proper divisors (530093).

212406091 is an equidigital number, since it uses as much as digits as its factorization.

212406091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530092.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 212406091 is about 14574.1583290425. The cubic root of 212406091 is about 596.6536780599.

The spelling of 212406091 in words is "two hundred twelve million, four hundred six thousand, ninety-one".