1311232444651 has 4 divisors (see below), whose sum is σ = 1380244678600. Its totient is φ = 1242220210704.

The previous prime is 1311232444637. The next prime is 1311232444729. The reversal of 1311232444651 is 1564442321131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1311232444651 - 2⁹ = 1311232444139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311232444651.

It is not an unprimeable number, because it can be changed into a prime (1311232444451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34506116946 + ... + 34506116983.

It is an arithmetic number, because the mean of its divisors is an integer number (345061169650).

Almost surely, 2^{1311232444651} is an apocalyptic number.

1311232444651 is a deficient number, since it is larger than the sum of its proper divisors (69012233949).

1311232444651 is an equidigital number, since it uses as much as digits as its factorization.

1311232444651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69012233948.

The product of its digits is 69120, while the sum is 37.

Adding to 1311232444651 its reverse (1564442321131), we get a palindrome (2875674765782).

The spelling of 1311232444651 in words is "one trillion, three hundred eleven billion, two hundred thirty-two million, four hundred forty-four thousand, six hundred fifty-one".