8120426491 has 2 divisors, whose sum is σ = 8120426492. Its totient is φ = 8120426490.

The previous prime is 8120426443. The next prime is 8120426521. The reversal of 8120426491 is 1946240218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8120426491 - 2¹⁷ = 8120295419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8120426491.

It is not a weakly prime, because it can be changed into another prime (8120426401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060213245 + 4060213246.

It is an arithmetic number, because the mean of its divisors is an integer number (4060213246).

Almost surely, 2^8120426491 is an apocalyptic number.

8120426491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8120426491 is an equidigital number, since it uses as much as digits as its factorization.

8120426491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 8120426491 is about 90113.4090521494. The cubic root of 8120426491 is about 2009.9856018209.

The spelling of 8120426491 in words is "eight billion, one hundred twenty million, four hundred twenty-six thousand, four hundred ninety-one".