998646587 has 2 divisors, whose sum is σ = 998646588. Its totient is φ = 998646586.

The previous prime is 998646569. The next prime is 998646619. The reversal of 998646587 is 785646899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998646587 - 2¹⁴ = 998630203 is a prime.

It is not a weakly prime, because it can be changed into another prime (998646527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499323293 + 499323294.

It is an arithmetic number, because the mean of its divisors is an integer number (499323294).

Almost surely, 2^998646587 is an apocalyptic number.

998646587 is a deficient number, since it is larger than the sum of its proper divisors (1).

998646587 is an equidigital number, since it uses as much as digits as its factorization.

998646587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 62.

The square root of 998646587 is about 31601.3700177698. The cubic root of 998646587 is about 999.5486586550.

The spelling of 998646587 in words is "nine hundred ninety-eight million, six hundred forty-six thousand, five hundred eighty-seven".