1225888889 has 4 divisors (see below), whose sum is σ = 1255788660. Its totient is φ = 1195989120.

The previous prime is 1225888877. The next prime is 1225888897. The reversal of 1225888889 is 9888885221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9888885221 = 2089 ⋅4733789.

It can be written as a sum of positive squares in 2 ways, for example, as 15405625 + 1210483264 = 3925^2 + 34792^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225888889 - 2²⁸ = 957453433 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1225888289) 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 3 ways as a sum of consecutive naturals, for example, 14949824 + ... + 14949905.

It is an arithmetic number, because the mean of its divisors is an integer number (313947165).

Almost surely, 2^1225888889 is an apocalyptic number.

It is an amenable number.

1225888889 is a deficient number, since it is larger than the sum of its proper divisors (29899771).

1225888889 is an equidigital number, since it uses as much as digits as its factorization.

1225888889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29899770.

The product of its digits is 5898240, while the sum is 59.

The square root of 1225888889 is about 35012.6961115536. The cubic root of 1225888889 is about 1070.2462207412.

The spelling of 1225888889 in words is "one billion, two hundred twenty-five million, eight hundred eighty-eight thousand, eight hundred eighty-nine".