1281366126 has 24 divisors (see below), whose sum is σ = 2939605344. Its totient is φ = 401997120.

The previous prime is 1281366113. The next prime is 1281366127. The reversal of 1281366126 is 6216631821.

It is a happy number.

1281366126 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 36 + 612 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281366127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2093430 + ... + 2094041.

It is an arithmetic number, because the mean of its divisors is an integer number (122483556).

Almost surely, 2^1281366126 is an apocalyptic number.

1281366126 is an abundant number, since it is smaller than the sum of its proper divisors (1658239218).

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

1281366126 is a wasteful number, since it uses less digits than its factorization.

1281366126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4187496 (or 4187493 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1281366126 is about 35796.1747397679. The cubic root of 1281366126 is about 1086.1531839310.

Adding to 1281366126 its reverse (6216631821), we get a palindrome (7497997947).

The spelling of 1281366126 in words is "one billion, two hundred eighty-one million, three hundred sixty-six thousand, one hundred twenty-six".