851138837 has 2 divisors, whose sum is σ = 851138838. Its totient is φ = 851138836.

The previous prime is 851138807. The next prime is 851138843. The reversal of 851138837 is 738831158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521026276 + 330112561 = 22826^2 + 18169^2 .

It is a cyclic number.

It is not a de Polignac number, because 851138837 - 2⁸ = 851138581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851138807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425569418 + 425569419.

It is an arithmetic number, because the mean of its divisors is an integer number (425569419).

Almost surely, 2^851138837 is an apocalyptic number.

It is an amenable number.

851138837 is a deficient number, since it is larger than the sum of its proper divisors (1).

851138837 is an equidigital number, since it uses as much as digits as its factorization.

851138837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 851138837 is about 29174.2838301131. The cubic root of 851138837 is about 947.6911009850.

The spelling of 851138837 in words is "eight hundred fifty-one million, one hundred thirty-eight thousand, eight hundred thirty-seven".