1223139509 has 4 divisors (see below), whose sum is σ = 1223233440. Its totient is φ = 1223045580.

The previous prime is 1223139493. The next prime is 1223139521. The reversal of 1223139509 is 9059313221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1223139509 - 2⁴ = 1223139493 is a prime.

It is a super-2 number, since 2×1223139509² = 2992140516953522162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223139529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23537 + ... + 54774.

It is an arithmetic number, because the mean of its divisors is an integer number (305808360).

Almost surely, 2^1223139509 is an apocalyptic number.

It is an amenable number.

1223139509 is a deficient number, since it is larger than the sum of its proper divisors (93931).

1223139509 is an equidigital number, since it uses as much as digits as its factorization.

1223139509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93930.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 1223139509 is about 34973.4114578489. The cubic root of 1223139509 is about 1069.4455184606.

The spelling of 1223139509 in words is "one billion, two hundred twenty-three million, one hundred thirty-nine thousand, five hundred nine".