499498991 has 2 divisors, whose sum is σ = 499498992. Its totient is φ = 499498990.

The previous prime is 499498973. The next prime is 499499053. The reversal of 499498991 is 199894994.

It is an a-pointer prime, because the next prime (499499053) can be obtained adding 499498991 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 499498991 - 2¹⁸ = 499236847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499498091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249749495 + 249749496.

It is an arithmetic number, because the mean of its divisors is an integer number (249749496).

Almost surely, 2^499498991 is an apocalyptic number.

499498991 is a deficient number, since it is larger than the sum of its proper divisors (1).

499498991 is an equidigital number, since it uses as much as digits as its factorization.

499498991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7558272, while the sum is 62.

The square root of 499498991 is about 22349.4740654003. The cubic root of 499498991 is about 793.4353366517.

The spelling of 499498991 in words is "four hundred ninety-nine million, four hundred ninety-eight thousand, nine hundred ninety-one".