1225245312 has 128 divisors (see below), whose sum is σ = 3704803200. Its totient is φ = 398407680.

The previous prime is 1225245293. The next prime is 1225245313. The reversal of 1225245312 is 2135425221.

1225245312 is a `hidden beast` number, since 122 + 5 + 2 + 4 + 531 + 2 = 666.

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

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

It is not an unprimeable number, because it can be changed into a prime (1225245313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137373 + ... + 146019.

It is an arithmetic number, because the mean of its divisors is an integer number (28943775).

Almost surely, 2^1225245312 is an apocalyptic number.

1225245312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225245312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1852401600).

1225245312 is an abundant number, since it is smaller than the sum of its proper divisors (2479557888).

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

1225245312 is an equidigital number, since it uses as much as digits as its factorization.

1225245312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711 (or 8693 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 1225245312 is about 35003.5042817144. The cubic root of 1225245312 is about 1070.0588991364.

The spelling of 1225245312 in words is "one billion, two hundred twenty-five million, two hundred forty-five thousand, three hundred twelve".