1223221539 has 32 divisors (see below), whose sum is σ = 1747215360. Its totient is φ = 759002400.

The previous prime is 1223221523. The next prime is 1223221541. The reversal of 1223221539 is 9351223221.

It is not a de Polignac number, because 1223221539 - 2⁴ = 1223221523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223221579) 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 31 ways as a sum of consecutive naturals, for example, 798204 + ... + 799734.

It is an arithmetic number, because the mean of its divisors is an integer number (54600480).

Almost surely, 2^1223221539 is an apocalyptic number.

1223221539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1223221539 is a deficient number, since it is larger than the sum of its proper divisors (523993821).

1223221539 is a wasteful number, since it uses less digits than its factorization.

1223221539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791.

The product of its digits is 6480, while the sum is 30.

The square root of 1223221539 is about 34974.5841862344. The cubic root of 1223221539 is about 1069.4694254241.

The spelling of 1223221539 in words is "one billion, two hundred twenty-three million, two hundred twenty-one thousand, five hundred thirty-nine".