212769091 has 4 divisors (see below), whose sum is σ = 212908000. Its totient is φ = 212630184.

The previous prime is 212769079. The next prime is 212769121. The reversal of 212769091 is 190967212.

212769091 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 212769091 - 2²³ = 204380483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212769091.

It is not an unprimeable number, because it can be changed into a prime (212769001) 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, 67131 + ... + 70228.

It is an arithmetic number, because the mean of its divisors is an integer number (53227000).

Almost surely, 2^212769091 is an apocalyptic number.

212769091 is a deficient number, since it is larger than the sum of its proper divisors (138909).

212769091 is a wasteful number, since it uses less digits than its factorization.

212769091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138908.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 212769091 is about 14586.6065621857. The cubic root of 212769091 is about 596.9933764499.

The spelling of 212769091 in words is "two hundred twelve million, seven hundred sixty-nine thousand, ninety-one".