1231020330311 has 4 divisors (see below), whose sum is σ = 1284542953392. Its totient is φ = 1177497707232.

The previous prime is 1231020330307. The next prime is 1231020330313. The reversal of 1231020330311 is 1130330201321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231020330311 - 2² = 1231020330307 is a prime.

It is a super-2 number, since 2×1231020330311² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231020330313) 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, 26761311506 + ... + 26761311551.

It is an arithmetic number, because the mean of its divisors is an integer number (321135738348).

Almost surely, 2^{1231020330311} is an apocalyptic number.

1231020330311 is a deficient number, since it is larger than the sum of its proper divisors (53522623081).

1231020330311 is an equidigital number, since it uses as much as digits as its factorization.

1231020330311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53522623080.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 1231020330311 its reverse (1130330201321), we get a palindrome (2361350531632).

The spelling of 1231020330311 in words is "one trillion, two hundred thirty-one billion, twenty million, three hundred thirty thousand, three hundred eleven".