9854421491 has 2 divisors, whose sum is σ = 9854421492. Its totient is φ = 9854421490.

The previous prime is 9854421449. The next prime is 9854421523. The reversal of 9854421491 is 1941244589.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9854421491 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (9854421431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927210745 + 4927210746.

It is an arithmetic number, because the mean of its divisors is an integer number (4927210746).

Almost surely, 2^9854421491 is an apocalyptic number.

9854421491 is a deficient number, since it is larger than the sum of its proper divisors (1).

9854421491 is an equidigital number, since it uses as much as digits as its factorization.

9854421491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 47.

The square root of 9854421491 is about 99269.4388570823. The cubic root of 9854421491 is about 2143.9288969740.

The spelling of 9854421491 in words is "nine billion, eight hundred fifty-four million, four hundred twenty-one thousand, four hundred ninety-one".