851789489 has 2 divisors, whose sum is σ = 851789490. Its totient is φ = 851789488.

The previous prime is 851789483. The next prime is 851789557. The reversal of 851789489 is 984987158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819390625 + 32398864 = 28625^2 + 5692^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851789489 is a prime.

It is a super-2 number, since 2×851789489² = 1451090667141762242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (851789483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425894744 + 425894745.

It is an arithmetic number, because the mean of its divisors is an integer number (425894745).

Almost surely, 2^851789489 is an apocalyptic number.

It is an amenable number.

851789489 is a deficient number, since it is larger than the sum of its proper divisors (1).

851789489 is an equidigital number, since it uses as much as digits as its factorization.

851789489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 59.

The square root of 851789489 is about 29185.4328218719. The cubic root of 851789489 is about 947.9325265614.

The spelling of 851789489 in words is "eight hundred fifty-one million, seven hundred eighty-nine thousand, four hundred eighty-nine".