805261399 has 2 divisors, whose sum is σ = 805261400. Its totient is φ = 805261398.

The previous prime is 805261397. The next prime is 805261403. The reversal of 805261399 is 993162508.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805261399 - 2¹ = 805261397 is a prime.

Together with 805261397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805261397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402630699 + 402630700.

It is an arithmetic number, because the mean of its divisors is an integer number (402630700).

Almost surely, 2^805261399 is an apocalyptic number.

805261399 is a deficient number, since it is larger than the sum of its proper divisors (1).

805261399 is an equidigital number, since it uses as much as digits as its factorization.

805261399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 805261399 is about 28377.1280964089. The cubic root of 805261399 is about 930.3484257334.

The spelling of 805261399 in words is "eight hundred five million, two hundred sixty-one thousand, three hundred ninety-nine".