998778967 has 2 divisors, whose sum is σ = 998778968. Its totient is φ = 998778966.

The previous prime is 998778961. The next prime is 998779003. The reversal of 998778967 is 769877899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998778967 - 2³ = 998778959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998778896 and 998778905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998778961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499389483 + 499389484.

It is an arithmetic number, because the mean of its divisors is an integer number (499389484).

Almost surely, 2^998778967 is an apocalyptic number.

998778967 is a deficient number, since it is larger than the sum of its proper divisors (1).

998778967 is an equidigital number, since it uses as much as digits as its factorization.

998778967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 70.

The square root of 998778967 is about 31603.4644778069. The cubic root of 998778967 is about 999.5928232296.

The spelling of 998778967 in words is "nine hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred sixty-seven".