1131323212013 has 4 divisors (see below), whose sum is σ = 1131374404380. Its totient is φ = 1131272019648.

The previous prime is 1131323211983. The next prime is 1131323212057. The reversal of 1131323212013 is 3102123231311.

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 305591156809 + 825732055204 = 552803^2 + 908698^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131323212013 - 2²⁸ = 1131054776557 is a prime.

It is a super-2 number, since 2×1131323212013² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131323212013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131323214013) 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, 25563020 + ... + 25607237.

It is an arithmetic number, because the mean of its divisors is an integer number (282843601095).

Almost surely, 2^{1131323212013} is an apocalyptic number.

It is an amenable number.

1131323212013 is a deficient number, since it is larger than the sum of its proper divisors (51192367).

1131323212013 is an equidigital number, since it uses as much as digits as its factorization.

1131323212013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51192366.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1131323212013 its reverse (3102123231311), we get a palindrome (4233446443324).

The spelling of 1131323212013 in words is "one trillion, one hundred thirty-one billion, three hundred twenty-three million, two hundred twelve thousand, thirteen".