499861997 has 2 divisors, whose sum is σ = 499861998. Its totient is φ = 499861996.

The previous prime is 499861991. The next prime is 499862017. The reversal of 499861997 is 799168994.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259177801 + 240684196 = 16099^2 + 15514^2 .

It is a cyclic number.

It is not a de Polignac number, because 499861997 - 2²² = 495667693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499861991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249930998 + 249930999.

It is an arithmetic number, because the mean of its divisors is an integer number (249930999).

Almost surely, 2^499861997 is an apocalyptic number.

It is an amenable number.

499861997 is a deficient number, since it is larger than the sum of its proper divisors (1).

499861997 is an equidigital number, since it uses as much as digits as its factorization.

499861997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 62.

The square root of 499861997 is about 22357.5937211499. The cubic root of 499861997 is about 793.6274972291.

The spelling of 499861997 in words is "four hundred ninety-nine million, eight hundred sixty-one thousand, nine hundred ninety-seven".