851138807 has 2 divisors, whose sum is σ = 851138808. Its totient is φ = 851138806.

The previous prime is 851138797. The next prime is 851138837. The reversal of 851138807 is 708831158.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 851138807 - 2⁴ = 851138791 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 (851138837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425569403 + 425569404.

It is an arithmetic number, because the mean of its divisors is an integer number (425569404).

Almost surely, 2^851138807 is an apocalyptic number.

851138807 is a deficient number, since it is larger than the sum of its proper divisors (1).

851138807 is an equidigital number, since it uses as much as digits as its factorization.

851138807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 41.

The square root of 851138807 is about 29174.2833159617. The cubic root of 851138807 is about 947.6910898506.

The spelling of 851138807 in words is "eight hundred fifty-one million, one hundred thirty-eight thousand, eight hundred seven".