1231345520311 has 8 divisors (see below), whose sum is σ = 1235441905040. Its totient is φ = 1227250170432.

The previous prime is 1231345520303. The next prime is 1231345520333. The reversal of 1231345520311 is 1130255431321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231345520311 - 2³ = 1231345520303 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 (1231345520371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2162605 + ... + 2671993.

It is an arithmetic number, because the mean of its divisors is an integer number (154430238130).

Almost surely, 2^{1231345520311} is an apocalyptic number.

1231345520311 is a deficient number, since it is larger than the sum of its proper divisors (4096384729).

1231345520311 is an equidigital number, since it uses as much as digits as its factorization.

1231345520311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517425.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 1231345520311 in words is "one trillion, two hundred thirty-one billion, three hundred forty-five million, five hundred twenty thousand, three hundred eleven".