1311535445431 has 4 divisors (see below), whose sum is σ = 1315293427000. Its totient is φ = 1307777463864.

The previous prime is 1311535445401. The next prime is 1311535445531. The reversal of 1311535445431 is 1345445351131.

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 1311535445431 - 2⁷ = 1311535445303 is a prime.

It is a super-2 number, since 2×1311535445431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311535445401) 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, 1878990261 + ... + 1878990958.

It is an arithmetic number, because the mean of its divisors is an integer number (328823356750).

Almost surely, 2^{1311535445431} is an apocalyptic number.

1311535445431 is a deficient number, since it is larger than the sum of its proper divisors (3757981569).

1311535445431 is an equidigital number, since it uses as much as digits as its factorization.

1311535445431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757981568.

The product of its digits is 216000, while the sum is 40.

The spelling of 1311535445431 in words is "one trillion, three hundred eleven billion, five hundred thirty-five million, four hundred forty-five thousand, four hundred thirty-one".