191020842031 has 2 divisors, whose sum is σ = 191020842032. Its totient is φ = 191020842030.

The previous prime is 191020841971. The next prime is 191020842053. The reversal of 191020842031 is 130248020191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191020842031 is a prime.

It is a super-2 number, since 2×191020842031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191020841984 and 191020842002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191020845031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95510421015 + 95510421016.

It is an arithmetic number, because the mean of its divisors is an integer number (95510421016).

Almost surely, 2^191020842031 is an apocalyptic number.

191020842031 is a deficient number, since it is larger than the sum of its proper divisors (1).

191020842031 is an equidigital number, since it uses as much as digits as its factorization.

191020842031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 191020842031 in words is "one hundred ninety-one billion, twenty million, eight hundred forty-two thousand, thirty-one".