227891989 has 4 divisors (see below), whose sum is σ = 245422156. Its totient is φ = 210361824.

The previous prime is 227891977. The next prime is 227891999. The reversal of 227891989 is 989198722.

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 57380625 + 170511364 = 7575^2 + 13058^2 .

It is a cyclic number.

It is not a de Polignac number, because 227891989 - 2¹¹ = 227889941 is a prime.

It is a super-2 number, since 2×227891989² = 103869517300752242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227891969) 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, 8765064 + ... + 8765089.

It is an arithmetic number, because the mean of its divisors is an integer number (61355539).

Almost surely, 2^227891989 is an apocalyptic number.

It is an amenable number.

227891989 is a deficient number, since it is larger than the sum of its proper divisors (17530167).

227891989 is a wasteful number, since it uses less digits than its factorization.

227891989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17530166.

The product of its digits is 1306368, while the sum is 55.

The square root of 227891989 is about 15096.0918452426. The cubic root of 227891989 is about 610.8149896603.

The spelling of 227891989 in words is "two hundred twenty-seven million, eight hundred ninety-one thousand, nine hundred eighty-nine".