99777859 has 2 divisors, whose sum is σ = 99777860. Its totient is φ = 99777858.

The previous prime is 99777857. The next prime is 99777877. The reversal of 99777859 is 95877799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99777859 - 2¹ = 99777857 is a prime.

It is a super-2 number, since 2×99777859² = 19911242293247762, which contains 22 as substring.

Together with 99777857, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 99777797 and 99777806.

It is not a weakly prime, because it can be changed into another prime (99777857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49888929 + 49888930.

It is an arithmetic number, because the mean of its divisors is an integer number (49888930).

Almost surely, 2^99777859 is an apocalyptic number.

99777859 is a deficient number, since it is larger than the sum of its proper divisors (1).

99777859 is an equidigital number, since it uses as much as digits as its factorization.

99777859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10001880, while the sum is 61.

The square root of 99777859 is about 9988.8867748113. The cubic root of 99777859 is about 463.8149328220.

The spelling of 99777859 in words is "ninety-nine million, seven hundred seventy-seven thousand, eight hundred fifty-nine".