1231332101 has 4 divisors (see below), whose sum is σ = 1231403712. Its totient is φ = 1231260492.

The previous prime is 1231332079. The next prime is 1231332119. The reversal of 1231332101 is 1012331321.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1012331321 = 3011 ⋅336211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231332101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231332101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231332181) 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, 7226 + ... + 50148.

It is an arithmetic number, because the mean of its divisors is an integer number (307850928).

Almost surely, 2^1231332101 is an apocalyptic number.

It is an amenable number.

1231332101 is a deficient number, since it is larger than the sum of its proper divisors (71611).

1231332101 is an equidigital number, since it uses as much as digits as its factorization.

1231332101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71610.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231332101 is about 35090.3419903540. The cubic root of 1231332101 is about 1071.8279236335.

Adding to 1231332101 its reverse (1012331321), we get a palindrome (2243663422).

The spelling of 1231332101 in words is "one billion, two hundred thirty-one million, three hundred thirty-two thousand, one hundred one".