999487997 has 2 divisors, whose sum is σ = 999487998. Its totient is φ = 999487996.

The previous prime is 999487991. The next prime is 999487999. The reversal of 999487997 is 799784999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997864921 + 1623076 = 31589^2 + 1274^2 .

It is a cyclic number.

It is not a de Polignac number, because 999487997 - 2⁴ = 999487981 is a prime.

It is a super-2 number, since 2×999487997² = 1997952512294144018, which contains 22 as substring.

Together with 999487999, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999487997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999487991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499743998 + 499743999.

It is an arithmetic number, because the mean of its divisors is an integer number (499743999).

Almost surely, 2^999487997 is an apocalyptic number.

It is an amenable number.

999487997 is a deficient number, since it is larger than the sum of its proper divisors (1).

999487997 is an equidigital number, since it uses as much as digits as its factorization.

999487997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92588832, while the sum is 71.

The square root of 999487997 is about 31614.6800869469. The cubic root of 999487997 is about 999.8293031976.

The spelling of 999487997 in words is "nine hundred ninety-nine million, four hundred eighty-seven thousand, nine hundred ninety-seven".