918092221 has 4 divisors (see below), whose sum is σ = 918318492. Its totient is φ = 917865952.

The previous prime is 918092177. The next prime is 918092233. The reversal of 918092221 is 122290819.

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

It can be written as a sum of positive squares in 2 ways, for example, as 575472121 + 342620100 = 23989^2 + 18510^2 .

It is a cyclic number.

It is not a de Polignac number, because 918092221 - 2⁷ = 918092093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918092261) 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, 106936 + ... + 115201.

It is an arithmetic number, because the mean of its divisors is an integer number (229579623).

Almost surely, 2^918092221 is an apocalyptic number.

It is an amenable number.

918092221 is a deficient number, since it is larger than the sum of its proper divisors (226271).

918092221 is a wasteful number, since it uses less digits than its factorization.

918092221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226270.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 918092221 is about 30300.0366501429. The cubic root of 918092221 is about 971.9160839820.

The spelling of 918092221 in words is "nine hundred eighteen million, ninety-two thousand, two hundred twenty-one".