806357861 has 2 divisors, whose sum is σ = 806357862. Its totient is φ = 806357860.

The previous prime is 806357857. The next prime is 806357899. The reversal of 806357861 is 168753608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805708225 + 649636 = 28385^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 806357861 - 2² = 806357857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806357561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403178930 + 403178931.

It is an arithmetic number, because the mean of its divisors is an integer number (403178931).

Almost surely, 2^806357861 is an apocalyptic number.

It is an amenable number.

806357861 is a deficient number, since it is larger than the sum of its proper divisors (1).

806357861 is an equidigital number, since it uses as much as digits as its factorization.

806357861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 806357861 is about 28396.4409917863. The cubic root of 806357861 is about 930.7704953261.

The spelling of 806357861 in words is "eight hundred six million, three hundred fifty-seven thousand, eight hundred sixty-one".