1231300312111 has 4 divisors (see below), whose sum is σ = 1231958411424. Its totient is φ = 1230642212800.

The previous prime is 1231300312093. The next prime is 1231300312139. The reversal of 1231300312111 is 1112130031321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231300312111 is a prime.

It is a super-2 number, since 2×1231300312111² (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 (1231300310111) 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, 329046850 + ... + 329050591.

It is an arithmetic number, because the mean of its divisors is an integer number (307989602856).

Almost surely, 2^{1231300312111} is an apocalyptic number.

1231300312111 is a deficient number, since it is larger than the sum of its proper divisors (658099313).

1231300312111 is an equidigital number, since it uses as much as digits as its factorization.

1231300312111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658099312.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1231300312111 its reverse (1112130031321), we get a palindrome (2343430343432).

The spelling of 1231300312111 in words is "one trillion, two hundred thirty-one billion, three hundred million, three hundred twelve thousand, one hundred eleven".