1225161344 has 128 divisors (see below), whose sum is σ = 2873707200. Its totient is φ = 514252800.

The previous prime is 1225161319. The next prime is 1225161349. The reversal of 1225161344 is 4431615221.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1225161349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096274 + ... + 1097390.

Almost surely, 2^1225161344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225161344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1436853600).

1225161344 is an abundant number, since it is smaller than the sum of its proper divisors (1648545856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225161344 is a wasteful number, since it uses less digits than its factorization.

1225161344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1190 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 1225161344 is about 35002.3048383960. The cubic root of 1225161344 is about 1070.0344543015.

Adding to 1225161344 its reverse (4431615221), we get a palindrome (5656776565).

The spelling of 1225161344 in words is "one billion, two hundred twenty-five million, one hundred sixty-one thousand, three hundred forty-four".