1531313323013 has 4 divisors (see below), whose sum is σ = 1597892163168. Its totient is φ = 1464734482860.

The previous prime is 1531313322991. The next prime is 1531313323021. The reversal of 1531313323013 is 3103233131351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1531313323013 - 2¹⁸ = 1531313060869 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 (1531313322013) 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, 33289420043 + ... + 33289420088.

It is an arithmetic number, because the mean of its divisors is an integer number (399473040792).

Almost surely, 2^{1531313323013} is an apocalyptic number.

It is an amenable number.

1531313323013 is a deficient number, since it is larger than the sum of its proper divisors (66578840155).

1531313323013 is an equidigital number, since it uses as much as digits as its factorization.

1531313323013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66578840154.

The product of its (nonzero) digits is 7290, while the sum is 29.

Adding to 1531313323013 its reverse (3103233131351), we get a palindrome (4634546454364).

The spelling of 1531313323013 in words is "one trillion, five hundred thirty-one billion, three hundred thirteen million, three hundred twenty-three thousand, thirteen".