1311433141 has 4 divisors (see below), whose sum is σ = 1315324972. Its totient is φ = 1307541312.

The previous prime is 1311433127. The next prime is 1311433163. The reversal of 1311433141 is 1413341131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 826332516 + 485100625 = 28746^2 + 22025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311433141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311433111) 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, 1945410 + ... + 1946083.

It is an arithmetic number, because the mean of its divisors is an integer number (328831243).

Almost surely, 2^1311433141 is an apocalyptic number.

It is an amenable number.

1311433141 is a deficient number, since it is larger than the sum of its proper divisors (3891831).

1311433141 is an equidigital number, since it uses as much as digits as its factorization.

1311433141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3891830.

The product of its digits is 432, while the sum is 22.

The square root of 1311433141 is about 36213.7148191124. The cubic root of 1311433141 is about 1094.5830487217.

Adding to 1311433141 its reverse (1413341131), we get a palindrome (2724774272).

The spelling of 1311433141 in words is "one billion, three hundred eleven million, four hundred thirty-three thousand, one hundred forty-one".