8742421091 has 2 divisors, whose sum is σ = 8742421092. Its totient is φ = 8742421090.

The previous prime is 8742421069. The next prime is 8742421123. The reversal of 8742421091 is 1901242478.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8742421091 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8742421591) 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, 4371210545 + 4371210546.

It is an arithmetic number, because the mean of its divisors is an integer number (4371210546).

Almost surely, 2^8742421091 is an apocalyptic number.

8742421091 is a deficient number, since it is larger than the sum of its proper divisors (1).

8742421091 is an equidigital number, since it uses as much as digits as its factorization.

8742421091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 8742421091 is about 93500.9149206573. The cubic root of 8742421091 is about 2060.0475285952.

The spelling of 8742421091 in words is "eight billion, seven hundred forty-two million, four hundred twenty-one thousand, ninety-one".