806642251 has 8 divisors (see below), whose sum is σ = 815396400. Its totient is φ = 797916672.

The previous prime is 806642237. The next prime is 806642297. The reversal of 806642251 is 152246608.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 806642251 - 2⁹ = 806641739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806642201) 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 in 7 ways as a sum of consecutive naturals, for example, 52275 + ... + 65923.

It is an arithmetic number, because the mean of its divisors is an integer number (101924550).

Almost surely, 2^806642251 is an apocalyptic number.

806642251 is a deficient number, since it is larger than the sum of its proper divisors (8754149).

806642251 is a wasteful number, since it uses less digits than its factorization.

806642251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14285.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 806642251 is about 28401.4480440699. The cubic root of 806642251 is about 930.8799052715.

Adding to 806642251 its reverse (152246608), we get a palindrome (958888859).

The spelling of 806642251 in words is "eight hundred six million, six hundred forty-two thousand, two hundred fifty-one".