842811491 has 2 divisors, whose sum is σ = 842811492. Its totient is φ = 842811490.

The previous prime is 842811469. The next prime is 842811503. The reversal of 842811491 is 194118248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842811491 - 2¹⁰ = 842810467 is a prime.

It is not a weakly prime, because it can be changed into another prime (842811391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421405745 + 421405746.

It is an arithmetic number, because the mean of its divisors is an integer number (421405746).

Almost surely, 2^842811491 is an apocalyptic number.

842811491 is a deficient number, since it is larger than the sum of its proper divisors (1).

842811491 is an equidigital number, since it uses as much as digits as its factorization.

842811491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 38.

The square root of 842811491 is about 29031.2158029939. The cubic root of 842811491 is about 944.5903027010.

The spelling of 842811491 in words is "eight hundred forty-two million, eight hundred eleven thousand, four hundred ninety-one".