1311345651 has 32 divisors (see below), whose sum is σ = 2182722048. Its totient is φ = 680336640.

The previous prime is 1311345649. The next prime is 1311345653. The reversal of 1311345651 is 1565431131.

It is an interprime number because it is at equal distance from previous prime (1311345649) and next prime (1311345653).

It is not a de Polignac number, because 1311345651 - 2¹ = 1311345649 is a prime.

It is a super-2 number, since 2×1311345651² = 3439254832793227602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311345653) 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 31 ways as a sum of consecutive naturals, for example, 199351 + ... + 205823.

It is an arithmetic number, because the mean of its divisors is an integer number (68210064).

Almost surely, 2^1311345651 is an apocalyptic number.

1311345651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1311345651 is a deficient number, since it is larger than the sum of its proper divisors (871376397).

1311345651 is a wasteful number, since it uses less digits than its factorization.

1311345651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371.

The product of its digits is 5400, while the sum is 30.

The square root of 1311345651 is about 36212.5068312041. The cubic root of 1311345651 is about 1094.5587071070.

Adding to 1311345651 its reverse (1565431131), we get a palindrome (2876776782).

The spelling of 1311345651 in words is "one billion, three hundred eleven million, three hundred forty-five thousand, six hundred fifty-one".