1231100101 has 48 divisors (see below), whose sum is σ = 1649676672. Its totient is φ = 896163840.

The previous prime is 1231100099. The next prime is 1231100137. The reversal of 1231100101 is 1010011321.

It is not a de Polignac number, because 1231100101 - 2¹ = 1231100099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231100701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2778786 + ... + 2779228.

It is an arithmetic number, because the mean of its divisors is an integer number (34368264).

Almost surely, 2^1231100101 is an apocalyptic number.

1231100101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231100101 is a deficient number, since it is larger than the sum of its proper divisors (418576571).

1231100101 is a wasteful number, since it uses less digits than its factorization.

1231100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1231100101 is about 35087.0360817211. The cubic root of 1231100101 is about 1071.7606036697.

Adding to 1231100101 its reverse (1010011321), we get a palindrome (2241111422).

It can be divided in two parts, 12 and 31100101, that added together give a palindrome (31100113).

The spelling of 1231100101 in words is "one billion, two hundred thirty-one million, one hundred thousand, one hundred one".