1231000011111 has 64 divisors (see below), whose sum is σ = 1912377600000. Its totient is φ = 697969198080.

The previous prime is 1231000011089. The next prime is 1231000011161. The reversal of 1231000011111 is 1111100001321.

It is not a de Polignac number, because 1231000011111 - 2³³ = 1222410076519 is a prime.

It is a super-2 number, since 2×1231000011111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231000011161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3869890 + ... + 4175888.

It is an arithmetic number, because the mean of its divisors is an integer number (29880900000).

Almost surely, 2^{1231000011111} is an apocalyptic number.

1231000011111 is a deficient number, since it is larger than the sum of its proper divisors (681377588889).

1231000011111 is a wasteful number, since it uses less digits than its factorization.

1231000011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306184.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 1231000011111 its reverse (1111100001321), we get a palindrome (2342100012432).

The spelling of 1231000011111 in words is "one trillion, two hundred thirty-one billion, eleven thousand, one hundred eleven".