849999977 has 2 divisors, whose sum is σ = 849999978. Its totient is φ = 849999976.

The previous prime is 849999971. The next prime is 850000013. The reversal of 849999977 is 779999948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441798361 + 408201616 = 21019^2 + 20204^2 .

It is a cyclic number.

It is not a de Polignac number, because 849999977 - 2¹⁴ = 849983593 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 849999977.

It is not a weakly prime, because it can be changed into another prime (849999971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424999988 + 424999989.

It is an arithmetic number, because the mean of its divisors is an integer number (424999989).

Almost surely, 2^849999977 is an apocalyptic number.

It is an amenable number.

849999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

849999977 is an equidigital number, since it uses as much as digits as its factorization.

849999977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 71.

The square root of 849999977 is about 29154.7590797798. The cubic root of 849999977 is about 947.2682286419.

The spelling of 849999977 in words is "eight hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".