1311126461 has 4 divisors (see below), whose sum is σ = 1311207552. Its totient is φ = 1311045372.

The previous prime is 1311126409. The next prime is 1311126473. The reversal of 1311126461 is 1646211131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311126461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311126461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311126161) 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 3 ways as a sum of consecutive naturals, for example, 7091 + ... + 51696.

It is an arithmetic number, because the mean of its divisors is an integer number (327801888).

Almost surely, 2^1311126461 is an apocalyptic number.

It is an amenable number.

1311126461 is a deficient number, since it is larger than the sum of its proper divisors (81091).

1311126461 is an equidigital number, since it uses as much as digits as its factorization.

1311126461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81090.

The product of its digits is 864, while the sum is 26.

The square root of 1311126461 is about 36209.4802641518. The cubic root of 1311126461 is about 1094.4977189429.

Adding to 1311126461 its reverse (1646211131), we get a palindrome (2957337592).

The spelling of 1311126461 in words is "one billion, three hundred eleven million, one hundred twenty-six thousand, four hundred sixty-one".