862721851 has 2 divisors, whose sum is σ = 862721852. Its totient is φ = 862721850.

The previous prime is 862721843. The next prime is 862721879. The reversal of 862721851 is 158127268.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 862721851 - 2³ = 862721843 is a prime.

It is not a weakly prime, because it can be changed into another prime (862721051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431360925 + 431360926.

It is an arithmetic number, because the mean of its divisors is an integer number (431360926).

Almost surely, 2^862721851 is an apocalyptic number.

862721851 is a deficient number, since it is larger than the sum of its proper divisors (1).

862721851 is an equidigital number, since it uses as much as digits as its factorization.

862721851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 862721851 is about 29372.1271105788. The cubic root of 862721851 is about 951.9707384993.

The spelling of 862721851 in words is "eight hundred sixty-two million, seven hundred twenty-one thousand, eight hundred fifty-one".