855651091 has 2 divisors, whose sum is σ = 855651092. Its totient is φ = 855651090.

The previous prime is 855651079. The next prime is 855651103. The reversal of 855651091 is 190156558.

It is a balanced prime because it is at equal distance from previous prime (855651079) and next prime (855651103).

It is a cyclic number.

It is not a de Polignac number, because 855651091 - 2⁷ = 855650963 is a prime.

It is not a weakly prime, because it can be changed into another prime (855651991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427825545 + 427825546.

It is an arithmetic number, because the mean of its divisors is an integer number (427825546).

Almost surely, 2^855651091 is an apocalyptic number.

855651091 is a deficient number, since it is larger than the sum of its proper divisors (1).

855651091 is an equidigital number, since it uses as much as digits as its factorization.

855651091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54000, while the sum is 40.

The square root of 855651091 is about 29251.5143368681. The cubic root of 855651091 is about 949.3628566191.

The spelling of 855651091 in words is "eight hundred fifty-five million, six hundred fifty-one thousand, ninety-one".