1281323025 has 18 divisors (see below), whose sum is σ = 2294992310. Its totient is φ = 683372160.

The previous prime is 1281323023. The next prime is 1281323039. The reversal of 1281323025 is 5203231821.

It can be written as a sum of positive squares in 3 ways, for example, as 86099841 + 1195223184 = 9279^2 + 34572^2 .

It is not a de Polignac number, because 1281323025 - 2¹ = 1281323023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1281323025.

It is not an unprimeable number, because it can be changed into a prime (1281323023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2847160 + ... + 2847609.

Almost surely, 2^1281323025 is an apocalyptic number.

1281323025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1281323025 is a deficient number, since it is larger than the sum of its proper divisors (1013669285).

1281323025 is a wasteful number, since it uses less digits than its factorization.

1281323025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694785 (or 5694777 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1281323025 is about 35795.5727011037. The cubic root of 1281323025 is about 1086.1410055712.

Adding to 1281323025 its reverse (5203231821), we get a palindrome (6484554846).

The spelling of 1281323025 in words is "one billion, two hundred eighty-one million, three hundred twenty-three thousand, twenty-five".