849311657 has 2 divisors, whose sum is σ = 849311658. Its totient is φ = 849311656.

The previous prime is 849311581. The next prime is 849311677. The reversal of 849311657 is 756113948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 791915881 + 57395776 = 28141^2 + 7576^2 .

It is a cyclic number.

It is not a de Polignac number, because 849311657 - 2²² = 845117353 is a prime.

It is not a weakly prime, because it can be changed into another prime (849311677) 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, 424655828 + 424655829.

It is an arithmetic number, because the mean of its divisors is an integer number (424655829).

Almost surely, 2^849311657 is an apocalyptic number.

It is an amenable number.

849311657 is a deficient number, since it is larger than the sum of its proper divisors (1).

849311657 is an equidigital number, since it uses as much as digits as its factorization.

849311657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 849311657 is about 29142.9520982347. The cubic root of 849311657 is about 947.0124640284.

The spelling of 849311657 in words is "eight hundred forty-nine million, three hundred eleven thousand, six hundred fifty-seven".