499998139 has 2 divisors, whose sum is σ = 499998140. Its totient is φ = 499998138.

The previous prime is 499998137. The next prime is 499998143. The reversal of 499998139 is 931899994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499998139 - 2¹ = 499998137 is a prime.

Together with 499998137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (499998133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999069 + 249999070.

It is an arithmetic number, because the mean of its divisors is an integer number (249999070).

Almost surely, 2^499998139 is an apocalyptic number.

499998139 is a deficient number, since it is larger than the sum of its proper divisors (1).

499998139 is an equidigital number, since it uses as much as digits as its factorization.

499998139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5668704, while the sum is 61.

The square root of 499998139 is about 22360.6381617341. The cubic root of 499998139 is about 793.6995412651.

The spelling of 499998139 in words is "four hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred thirty-nine".