999998507 has 2 divisors, whose sum is σ = 999998508. Its totient is φ = 999998506.

The previous prime is 999998501. The next prime is 999998509. The reversal of 999998507 is 705899999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999998507 - 2²⁸ = 731563051 is a prime.

Together with 999998509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999998501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999253 + 499999254.

It is an arithmetic number, because the mean of its divisors is an integer number (499999254).

Almost surely, 2^999998507 is an apocalyptic number.

999998507 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998507 is an equidigital number, since it uses as much as digits as its factorization.

999998507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16533720, while the sum is 65.

The square root of 999998507 is about 31622.7529952722. The cubic root of 999998507 is about 999.9995023331. Note that the first 3 decimals are identical.

The spelling of 999998507 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred seven".