1231101101 has 4 divisors (see below), whose sum is σ = 1231199772. Its totient is φ = 1231002432.

The previous prime is 1231101097. The next prime is 1231101149. The reversal of 1231101101 is 1011011321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 565203076 + 665898025 = 23774^2 + 25805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231101101 - 2² = 1231101097 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 (1231101701) 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, 27356 + ... + 56661.

It is an arithmetic number, because the mean of its divisors is an integer number (307799943).

Almost surely, 2^1231101101 is an apocalyptic number.

It is an amenable number.

1231101101 is a deficient number, since it is larger than the sum of its proper divisors (98671).

1231101101 is an equidigital number, since it uses as much as digits as its factorization.

1231101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98670.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1231101101 is about 35087.0503319957. The cubic root of 1231101101 is about 1071.7608938601.

Adding to 1231101101 its reverse (1011011321), we get a palindrome (2242112422).

The spelling of 1231101101 in words is "one billion, two hundred thirty-one million, one hundred one thousand, one hundred one".