1311243051 has 8 divisors (see below), whose sum is σ = 1749361104. Its totient is φ = 873643520.

The previous prime is 1311243049. The next prime is 1311243071. The reversal of 1311243051 is 1503421131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311243051 - 2¹ = 1311243049 is a prime.

It is a super-3 number, since 3×1311243051³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311243071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123690 + ... + 133871.

It is an arithmetic number, because the mean of its divisors is an integer number (218670138).

Almost surely, 2^1311243051 is an apocalyptic number.

1311243051 is a deficient number, since it is larger than the sum of its proper divisors (438118053).

1311243051 is a wasteful number, since it uses less digits than its factorization.

1311243051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259261.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1311243051 is about 36211.0901658594. The cubic root of 1311243051 is about 1094.5301601834.

Adding to 1311243051 its reverse (1503421131), we get a palindrome (2814664182).

The spelling of 1311243051 in words is "one billion, three hundred eleven million, two hundred forty-three thousand, fifty-one".