805401749 has 2 divisors, whose sum is σ = 805401750. Its totient is φ = 805401748.

The previous prime is 805401713. The next prime is 805401803. The reversal of 805401749 is 947104508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791578225 + 13823524 = 28135^2 + 3718^2 .

It is a cyclic number.

It is not a de Polignac number, because 805401749 - 2²⁸ = 536966293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805401349) 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, 402700874 + 402700875.

It is an arithmetic number, because the mean of its divisors is an integer number (402700875).

Almost surely, 2^805401749 is an apocalyptic number.

It is an amenable number.

805401749 is a deficient number, since it is larger than the sum of its proper divisors (1).

805401749 is an equidigital number, since it uses as much as digits as its factorization.

805401749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 805401749 is about 28379.6009309504. The cubic root of 805401749 is about 930.4024731174.

The spelling of 805401749 in words is "eight hundred five million, four hundred one thousand, seven hundred forty-nine".