999916877 has 2 divisors, whose sum is σ = 999916878. Its totient is φ = 999916876.

The previous prime is 999916871. The next prime is 999916889. The reversal of 999916877 is 778619999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 942551401 + 57365476 = 30701^2 + 7574^2 .

It is a cyclic number.

It is not a de Polignac number, because 999916877 - 2⁴ = 999916861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999916871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958438 + 499958439.

It is an arithmetic number, because the mean of its divisors is an integer number (499958439).

Almost surely, 2^999916877 is an apocalyptic number.

It is an amenable number.

999916877 is a deficient number, since it is larger than the sum of its proper divisors (1).

999916877 is an equidigital number, since it uses as much as digits as its factorization.

999916877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15431472, while the sum is 65.

The square root of 999916877 is about 31621.4622843410. The cubic root of 999916877 is about 999.9722915656.

The spelling of 999916877 in words is "nine hundred ninety-nine million, nine hundred sixteen thousand, eight hundred seventy-seven".