499991857 has 2 divisors, whose sum is σ = 499991858. Its totient is φ = 499991856.

The previous prime is 499991851. The next prime is 499991861. The reversal of 499991857 is 758199994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415792881 + 84198976 = 20391^2 + 9176^2 .

It is a cyclic number.

It is not a de Polignac number, because 499991857 - 2⁷ = 499991729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 499991795 and 499991804.

It is not a weakly prime, because it can be changed into another prime (499991851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249995928 + 249995929.

It is an arithmetic number, because the mean of its divisors is an integer number (249995929).

Almost surely, 2^499991857 is an apocalyptic number.

It is an amenable number.

499991857 is a deficient number, since it is larger than the sum of its proper divisors (1).

499991857 is an equidigital number, since it uses as much as digits as its factorization.

499991857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7348320, while the sum is 61.

The square root of 499991857 is about 22360.4976912411. The cubic root of 499991857 is about 793.6962172251.

The spelling of 499991857 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, eight hundred fifty-seven".