998860777 has 2 divisors, whose sum is σ = 998860778. Its totient is φ = 998860776.

The previous prime is 998860771. The next prime is 998860817. The reversal of 998860777 is 777068899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998812816 + 47961 = 31604^2 + 219^2 .

It is an emirp because it is prime and its reverse (777068899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998860777 - 2²³ = 990472169 is a prime.

It is not a weakly prime, because it can be changed into another prime (998860771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499430388 + 499430389.

It is an arithmetic number, because the mean of its divisors is an integer number (499430389).

Almost surely, 2^998860777 is an apocalyptic number.

It is an amenable number.

998860777 is a deficient number, since it is larger than the sum of its proper divisors (1).

998860777 is an equidigital number, since it uses as much as digits as its factorization.

998860777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The square root of 998860777 is about 31604.7587714255. The cubic root of 998860777 is about 999.6201147054.

The spelling of 998860777 in words is "nine hundred ninety-eight million, eight hundred sixty thousand, seven hundred seventy-seven".