231231320101 has 4 divisors (see below), whose sum is σ = 243401389600. Its totient is φ = 219061250604.

The previous prime is 231231320041. The next prime is 231231320189. The reversal of 231231320101 is 101023132132.

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 231231320101 - 2¹¹ = 231231318053 is a prime.

It is a super-2 number, since 2×231231320101² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 12170069479 = 231231320101 / (2 + 3 + 1 + 2 + 3 + 1 + 3 + 2 + 0 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231320401) 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, 6085034721 + ... + 6085034758.

It is an arithmetic number, because the mean of its divisors is an integer number (60850347400).

Almost surely, 2^231231320101 is an apocalyptic number.

It is an amenable number.

231231320101 is a deficient number, since it is larger than the sum of its proper divisors (12170069499).

231231320101 is a wasteful number, since it uses less digits than its factorization.

231231320101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12170069498.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231231320101 its reverse (101023132132), we get a palindrome (332254452233).

The spelling of 231231320101 in words is "two hundred thirty-one billion, two hundred thirty-one million, three hundred twenty thousand, one hundred one".