1223612125 has 8 divisors (see below), whose sum is σ = 1527068088. Its totient is φ = 978889600.

The previous prime is 1223612123. The next prime is 1223612153. The reversal of 1223612125 is 5212163221.

It can be written as a sum of positive squares in 4 ways, for example, as 116186841 + 1107425284 = 10779^2 + 33278^2 .

It is not a de Polignac number, because 1223612125 - 2¹ = 1223612123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223612125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223612123) 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 7 ways as a sum of consecutive naturals, for example, 4894324 + ... + 4894573.

It is an arithmetic number, because the mean of its divisors is an integer number (190883511).

Almost surely, 2^1223612125 is an apocalyptic number.

It is an amenable number.

1223612125 is a deficient number, since it is larger than the sum of its proper divisors (303455963).

1223612125 is an frugal number, since it uses more digits than its factorization.

1223612125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9788912 (or 9788902 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1223612125 is about 34980.1675953675. The cubic root of 1223612125 is about 1069.5832438179.

Adding to 1223612125 its reverse (5212163221), we get a palindrome (6435775346).

The spelling of 1223612125 in words is "one billion, two hundred twenty-three million, six hundred twelve thousand, one hundred twenty-five".