231101223131 has 4 divisors (see below), whose sum is σ = 231114811200. Its totient is φ = 231087635064.

The previous prime is 231101223127. The next prime is 231101223139. The reversal of 231101223131 is 131322101132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231101223131 - 2² = 231101223127 is a prime.

It is a super-2 number, since 2×231101223131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231101223139) 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, 6768491 + ... + 6802548.

It is an arithmetic number, because the mean of its divisors is an integer number (57778702800).

Almost surely, 2^231101223131 is an apocalyptic number.

231101223131 is a deficient number, since it is larger than the sum of its proper divisors (13588069).

231101223131 is a wasteful number, since it uses less digits than its factorization.

231101223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13588068.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 231101223131 its reverse (131322101132), we get a palindrome (362423324263).

The spelling of 231101223131 in words is "two hundred thirty-one billion, one hundred one million, two hundred twenty-three thousand, one hundred thirty-one".