22131289 has 2 divisors, whose sum is σ = 22131290. Its totient is φ = 22131288.

The previous prime is 22131287. The next prime is 22131397. The reversal of 22131289 is 98213122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11108889 + 11022400 = 3333^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 22131289 - 2¹ = 22131287 is a prime.

Together with 22131287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22131287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11065644 + 11065645.

It is an arithmetic number, because the mean of its divisors is an integer number (11065645).

Almost surely, 2^22131289 is an apocalyptic number.

It is an amenable number.

22131289 is a deficient number, since it is larger than the sum of its proper divisors (1).

22131289 is an equidigital number, since it uses as much as digits as its factorization.

22131289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 22131289 is about 4704.3903962150. The cubic root of 22131289 is about 280.7602172586.

The spelling of 22131289 in words is "twenty-two million, one hundred thirty-one thousand, two hundred eighty-nine".