1311535445531 has 2 divisors, whose sum is σ = 1311535445532. Its totient is φ = 1311535445530.

The previous prime is 1311535445401. The next prime is 1311535445537. The reversal of 1311535445531 is 1355445351131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311535445531 - 2²⁶ = 1311468336667 is a prime.

It is a super-2 number, since 2×1311535445531² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311535445537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655767722765 + 655767722766.

It is an arithmetic number, because the mean of its divisors is an integer number (655767722766).

Almost surely, 2^{1311535445531} is an apocalyptic number.

1311535445531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311535445531 is an equidigital number, since it uses as much as digits as its factorization.

1311535445531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270000, while the sum is 41.

The spelling of 1311535445531 in words is "one trillion, three hundred eleven billion, five hundred thirty-five million, four hundred forty-five thousand, five hundred thirty-one".