1225251144 has 64 divisors (see below), whose sum is σ = 3665289600. Its totient is φ = 376999488.

The previous prime is 1225251133. The next prime is 1225251151. The reversal of 1225251144 is 4411525221.

It is a happy number.

1225251144 is a `hidden beast` number, since 1 + 22 + 525 + 114 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 215364 + ... + 220979.

It is an arithmetic number, because the mean of its divisors is an integer number (57270150).

Almost surely, 2^1225251144 is an apocalyptic number.

It is an amenable number.

1225251144 is an abundant number, since it is smaller than the sum of its proper divisors (2440038456).

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

1225251144 is a wasteful number, since it uses less digits than its factorization.

1225251144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436371 (or 436361 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 1225251144 is about 35003.5875875602. The cubic root of 1225251144 is about 1070.0605969117.

Adding to 1225251144 its reverse (4411525221), we get a palindrome (5636776365).

It can be divided in two parts, 1225251 and 144, that added together give a triangular number (1225395 = T₁₅₆₅).

The spelling of 1225251144 in words is "one billion, two hundred twenty-five million, two hundred fifty-one thousand, one hundred forty-four".