1151230221 has 12 divisors (see below), whose sum is σ = 1685668348. Its totient is φ = 756972864.

The previous prime is 1151230217. The next prime is 1151230237. The reversal of 1151230221 is 1220321511.

It can be written as a sum of positive squares in 2 ways, for example, as 931775625 + 219454596 = 30525^2 + 14814^2 .

It is not a de Polignac number, because 1151230221 - 2² = 1151230217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1151230194 and 1151230203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151230211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 875470 + ... + 876783.

Almost surely, 2^1151230221 is an apocalyptic number.

It is an amenable number.

1151230221 is a deficient number, since it is larger than the sum of its proper divisors (534438127).

1151230221 is a wasteful number, since it uses less digits than its factorization.

1151230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752332 (or 1752329 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1151230221 is about 33929.7836863131. The cubic root of 1151230221 is about 1048.0630112479.

Adding to 1151230221 its reverse (1220321511), we get a palindrome (2371551732).

The spelling of 1151230221 in words is "one billion, one hundred fifty-one million, two hundred thirty thousand, two hundred twenty-one".