851252789 has 2 divisors, whose sum is σ = 851252790. Its totient is φ = 851252788.

The previous prime is 851252761. The next prime is 851252791. The reversal of 851252789 is 987252158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 826102564 + 25150225 = 28742^2 + 5015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851252789 is a prime.

Together with 851252791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851252719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425626394 + 425626395.

It is an arithmetic number, because the mean of its divisors is an integer number (425626395).

Almost surely, 2^851252789 is an apocalyptic number.

It is an amenable number.

851252789 is a deficient number, since it is larger than the sum of its proper divisors (1).

851252789 is an equidigital number, since it uses as much as digits as its factorization.

851252789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 47.

The square root of 851252789 is about 29176.2367175755. The cubic root of 851252789 is about 947.7333919614.

The spelling of 851252789 in words is "eight hundred fifty-one million, two hundred fifty-two thousand, seven hundred eighty-nine".