1223121535 has 4 divisors (see below), whose sum is σ = 1467745848. Its totient is φ = 978497224.

The previous prime is 1223121511. The next prime is 1223121547. The reversal of 1223121535 is 5351213221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1223121535 - 2⁵ = 1223121503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 122312149 + ... + 122312158.

It is an arithmetic number, because the mean of its divisors is an integer number (366936462).

Almost surely, 2^1223121535 is an apocalyptic number.

1223121535 is a deficient number, since it is larger than the sum of its proper divisors (244624313).

1223121535 is an equidigital number, since it uses as much as digits as its factorization.

1223121535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244624312.

The product of its digits is 1800, while the sum is 25.

The square root of 1223121535 is about 34973.1544902658. The cubic root of 1223121535 is about 1069.4402799446.

Adding to 1223121535 its reverse (5351213221), we get a palindrome (6574334756).

The spelling of 1223121535 in words is "one billion, two hundred twenty-three million, one hundred twenty-one thousand, five hundred thirty-five".