1805425091 has 2 divisors, whose sum is σ = 1805425092. Its totient is φ = 1805425090.

The previous prime is 1805425079. The next prime is 1805425093. The reversal of 1805425091 is 1905245081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1805425091 - 2²² = 1801230787 is a prime.

Together with 1805425093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1805425093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902712545 + 902712546.

It is an arithmetic number, because the mean of its divisors is an integer number (902712546).

Almost surely, 2^1805425091 is an apocalyptic number.

1805425091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1805425091 is an equidigital number, since it uses as much as digits as its factorization.

1805425091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1805425091 is about 42490.2940799425. The cubic root of 1805425091 is about 1217.6612659623.

The spelling of 1805425091 in words is "one billion, eight hundred five million, four hundred twenty-five thousand, ninety-one".