231383505383131 has 4 divisors (see below), whose sum is σ = 231571469239264. Its totient is φ = 231195541527000.

The previous prime is 231383505383039. The next prime is 231383505383137. The reversal of 231383505383131 is 131383505383132.

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 231383505383131 - 2⁹ = 231383505382619 is a prime.

It is a super-2 number, since 2×231383505383131² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231383505383137) 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, 93981926220 + ... + 93981928681.

It is an arithmetic number, because the mean of its divisors is an integer number (57892867309816).

Almost surely, 2^{231383505383131} is an apocalyptic number.

231383505383131 is a deficient number, since it is larger than the sum of its proper divisors (187963856133).

231383505383131 is a wasteful number, since it uses less digits than its factorization.

231383505383131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187963856132.

The product of its (nonzero) digits is 2332800, while the sum is 49.

Subtracting from 231383505383131 its reverse (131383505383132), we obtain a palindrome (99999999999999).

The spelling of 231383505383131 in words is "two hundred thirty-one trillion, three hundred eighty-three billion, five hundred five million, three hundred eighty-three thousand, one hundred thirty-one".