1231122101 has 4 divisors (see below), whose sum is σ = 1343042304. Its totient is φ = 1119201900.

The previous prime is 1231122097. The next prime is 1231122187. The reversal of 1231122101 is 1012211321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231122101 - 2² = 1231122097 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 (1231125101) 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, 55960085 + ... + 55960106.

It is an arithmetic number, because the mean of its divisors is an integer number (335760576).

Almost surely, 2^1231122101 is an apocalyptic number.

1231122101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1231122101 is a deficient number, since it is larger than the sum of its proper divisors (111920203).

1231122101 is a wasteful number, since it uses less digits than its factorization.

1231122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111920202.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1231122101 is about 35087.3495864250. The cubic root of 1231122101 is about 1071.7669878224.

Adding to 1231122101 its reverse (1012211321), we get a palindrome (2243333422).

It can be divided in two parts, 12 and 31122101, that added together give a palindrome (31122113).

The spelling of 1231122101 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred one".