1261311126 has 32 divisors (see below), whose sum is σ = 2588277888. Its totient is φ = 409527360.

The previous prime is 1261311109. The next prime is 1261311151. The reversal of 1261311126 is 6211131621.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1261311096 and 1261311105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164265 + ... + 171771.

It is an arithmetic number, because the mean of its divisors is an integer number (80883684).

Almost surely, 2^1261311126 is an apocalyptic number.

1261311126 is an abundant number, since it is smaller than the sum of its proper divisors (1326966762).

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

1261311126 is a wasteful number, since it uses less digits than its factorization.

1261311126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236.

The product of its digits is 432, while the sum is 24.

The square root of 1261311126 is about 35514.9422919424. The cubic root of 1261311126 is about 1080.4568043590.

Adding to 1261311126 its reverse (6211131621), we get a palindrome (7472442747).

The spelling of 1261311126 in words is "one billion, two hundred sixty-one million, three hundred eleven thousand, one hundred twenty-six".