845619857 has 2 divisors, whose sum is σ = 845619858. Its totient is φ = 845619856.

The previous prime is 845619821. The next prime is 845619889. The reversal of 845619857 is 758916548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439153936 + 406465921 = 20956^2 + 20161^2 .

It is a cyclic number.

It is not a de Polignac number, because 845619857 - 2¹² = 845615761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 845619799 and 845619808.

It is not a weakly prime, because it can be changed into another prime (845619557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422809928 + 422809929.

It is an arithmetic number, because the mean of its divisors is an integer number (422809929).

Almost surely, 2^845619857 is an apocalyptic number.

It is an amenable number.

845619857 is a deficient number, since it is larger than the sum of its proper divisors (1).

845619857 is an equidigital number, since it uses as much as digits as its factorization.

845619857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 53.

The square root of 845619857 is about 29079.5436174642. The cubic root of 845619857 is about 945.6383086153.

The spelling of 845619857 in words is "eight hundred forty-five million, six hundred nineteen thousand, eight hundred fifty-seven".