311521325345 has 4 divisors (see below), whose sum is σ = 373825590420. Its totient is φ = 249217060272.

The previous prime is 311521325321. The next prime is 311521325347. The reversal of 311521325345 is 543523125113.

It is a happy number.

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 149118773281 + 162402552064 = 386159^2 + 402992^2 .

It is a cyclic number.

It is not a de Polignac number, because 311521325345 - 2¹⁴ = 311521308961 is a prime.

It is a super-2 number, since 2×311521325345² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311521325347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31152132530 + ... + 31152132539.

It is an arithmetic number, because the mean of its divisors is an integer number (93456397605).

Almost surely, 2^311521325345 is an apocalyptic number.

It is an amenable number.

311521325345 is a deficient number, since it is larger than the sum of its proper divisors (62304265075).

311521325345 is an equidigital number, since it uses as much as digits as its factorization.

311521325345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62304265074.

The product of its digits is 54000, while the sum is 35.

The spelling of 311521325345 in words is "three hundred eleven billion, five hundred twenty-one million, three hundred twenty-five thousand, three hundred forty-five".