1225558109 has 4 divisors (see below), whose sum is σ = 1225669116. Its totient is φ = 1225447104.

The previous prime is 1225558097. The next prime is 1225558133. The reversal of 1225558109 is 9018555221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 174372025 + 1051186084 = 13205^2 + 32422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225558109 - 2¹⁶ = 1225492573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225558409) 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, 36854 + ... + 61719.

It is an arithmetic number, because the mean of its divisors is an integer number (306417279).

Almost surely, 2^1225558109 is an apocalyptic number.

It is an amenable number.

1225558109 is a deficient number, since it is larger than the sum of its proper divisors (111007).

1225558109 is an equidigital number, since it uses as much as digits as its factorization.

1225558109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111006.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1225558109 is about 35007.9720777997. The cubic root of 1225558109 is about 1070.1499510347.

The spelling of 1225558109 in words is "one billion, two hundred twenty-five million, five hundred fifty-eight thousand, one hundred nine".