1139851221 has 4 divisors (see below), whose sum is σ = 1519801632. Its totient is φ = 759900812.

The previous prime is 1139851169. The next prime is 1139851247. The reversal of 1139851221 is 1221589311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1139851221 - 2⁷ = 1139851093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1139851261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189975201 + ... + 189975206.

It is an arithmetic number, because the mean of its divisors is an integer number (379950408).

Almost surely, 2^1139851221 is an apocalyptic number.

It is an amenable number.

1139851221 is a deficient number, since it is larger than the sum of its proper divisors (379950411).

1139851221 is an equidigital number, since it uses as much as digits as its factorization.

1139851221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379950410.

The product of its digits is 4320, while the sum is 33.

The square root of 1139851221 is about 33761.6827335368. The cubic root of 1139851221 is about 1044.5984800853.

The spelling of 1139851221 in words is "one billion, one hundred thirty-nine million, eight hundred fifty-one thousand, two hundred twenty-one".