31132011121 has 4 divisors (see below), whose sum is σ = 31137537600. Its totient is φ = 31126484644.

The previous prime is 31132011091. The next prime is 31132011139. The reversal of 31132011121 is 12111023113.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-31132011121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31132011095 and 31132011104.

It is not an unprimeable number, because it can be changed into a prime (31132018121) 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, 2754781 + ... + 2766058.

It is an arithmetic number, because the mean of its divisors is an integer number (7784384400).

Almost surely, 2^31132011121 is an apocalyptic number.

It is an amenable number.

31132011121 is a deficient number, since it is larger than the sum of its proper divisors (5526479).

31132011121 is an equidigital number, since it uses as much as digits as its factorization.

31132011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526478.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31132011121 its reverse (12111023113), we get a palindrome (43243034234).

The spelling of 31132011121 in words is "thirty-one billion, one hundred thirty-two million, eleven thousand, one hundred twenty-one".