31211123111131 has 8 divisors (see below), whose sum is σ = 31875541553664. Its totient is φ = 30546719335080.

The previous prime is 31211123111101. The next prime is 31211123111137. The reversal of 31211123111131 is 13111132111213.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31211123111131 is a prime.

It is a super-2 number, since 2×31211123111131² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211123111137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689296 + ... + 7930786.

It is an arithmetic number, because the mean of its divisors is an integer number (3984442694208).

Almost surely, 2^{31211123111131} is an apocalyptic number.

31211123111131 is a deficient number, since it is larger than the sum of its proper divisors (664418442533).

31211123111131 is an equidigital number, since it uses as much as digits as its factorization.

31211123111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333241.

The product of its digits is 108, while the sum is 22.

Adding to 31211123111131 its reverse (13111132111213), we get a palindrome (44322255222344).

The spelling of 31211123111131 in words is "thirty-one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred eleven thousand, one hundred thirty-one".