31111011021131 has 2 divisors, whose sum is σ = 31111011021132. Its totient is φ = 31111011021130.

The previous prime is 31111011021121. The next prime is 31111011021133. The reversal of 31111011021131 is 13112011011113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31111011021131 - 2²² = 31111006826827 is a prime.

It is a super-2 number, since 2×31111011021131² (a number of 28 digits) contains 22 as substring.

Together with 31111011021133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31111011021133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555505510565 + 15555505510566.

It is an arithmetic number, because the mean of its divisors is an integer number (15555505510566).

Almost surely, 2^{31111011021131} is an apocalyptic number.

31111011021131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111011021131 is an equidigital number, since it uses as much as digits as its factorization.

31111011021131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 31111011021131 its reverse (13112011011113), we get a palindrome (44223022032244).

The spelling of 31111011021131 in words is "thirty-one trillion, one hundred eleven billion, eleven million, twenty-one thousand, one hundred thirty-one".