31423131121 has 8 divisors (see below), whose sum is σ = 32801241600. Its totient is φ = 30067799520.

The previous prime is 31423131097. The next prime is 31423131127. The reversal of 31423131121 is 12113132413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31423131121 - 2⁷ = 31423130993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31423131092 and 31423131101.

It is not an unprimeable number, because it can be changed into a prime (31423131127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5691901 + ... + 5697418.

It is an arithmetic number, because the mean of its divisors is an integer number (4100155200).

Almost surely, 2^31423131121 is an apocalyptic number.

31423131121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31423131121 is a deficient number, since it is larger than the sum of its proper divisors (1378110479).

31423131121 is a wasteful number, since it uses less digits than its factorization.

31423131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11389439.

The product of its digits is 432, while the sum is 22.

Adding to 31423131121 its reverse (12113132413), we get a palindrome (43536263534).

The spelling of 31423131121 in words is "thirty-one billion, four hundred twenty-three million, one hundred thirty-one thousand, one hundred twenty-one".