1001189221 has 2 divisors, whose sum is σ = 1001189222. Its totient is φ = 1001189220.

The previous prime is 1001189201. The next prime is 1001189269. The reversal of 1001189221 is 1229811001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 600789121 + 400400100 = 24511^2 + 20010^2 .

It is an emirp because it is prime and its reverse (1229811001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001189221 - 2¹³ = 1001181029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001189201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500594610 + 500594611.

It is an arithmetic number, because the mean of its divisors is an integer number (500594611).

Almost surely, 2^1001189221 is an apocalyptic number.

It is an amenable number.

1001189221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001189221 is an equidigital number, since it uses as much as digits as its factorization.

1001189221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1001189221 is about 31641.5742497114. The cubic root of 1001189221 is about 1000.3962499652.

The spelling of 1001189221 in words is "one billion, one million, one hundred eighty-nine thousand, two hundred twenty-one".