1281078225 has 36 divisors (see below), whose sum is σ = 2622350016. Its totient is φ = 585635040.

The previous prime is 1281078181. The next prime is 1281078229. The reversal of 1281078225 is 5228701821.

It is not a de Polignac number, because 1281078225 - 2⁸ = 1281077969 is a prime.

It is a super-2 number, since 2×1281078225² = 3282322837138301250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1281078225.

It is not an unprimeable number, because it can be changed into a prime (1281078229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 405117 + ... + 408266.

It is an arithmetic number, because the mean of its divisors is an integer number (72843056).

Almost surely, 2^1281078225 is an apocalyptic number.

1281078225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281078225 is an abundant number, since it is smaller than the sum of its proper divisors (1341271791).

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

1281078225 is a wasteful number, since it uses less digits than its factorization.

1281078225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813406 (or 813398 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 1281078225 is about 35792.1531204816. The cubic root of 1281078225 is about 1086.0718311716.

The spelling of 1281078225 in words is "one billion, two hundred eighty-one million, seventy-eight thousand, two hundred twenty-five".