998642507 has 2 divisors, whose sum is σ = 998642508. Its totient is φ = 998642506.

The previous prime is 998642503. The next prime is 998642539. The reversal of 998642507 is 705246899.

It is a happy number.

998642507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998642507 - 2² = 998642503 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998642501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499321253 + 499321254.

It is an arithmetic number, because the mean of its divisors is an integer number (499321254).

Almost surely, 2^998642507 is an apocalyptic number.

998642507 is a deficient number, since it is larger than the sum of its proper divisors (1).

998642507 is an equidigital number, since it uses as much as digits as its factorization.

998642507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 998642507 is about 31601.3054635406. The cubic root of 998642507 is about 999.5472974246.

The spelling of 998642507 in words is "nine hundred ninety-eight million, six hundred forty-two thousand, five hundred seven".