998266691 has 2 divisors, whose sum is σ = 998266692. Its totient is φ = 998266690.

The previous prime is 998266667. The next prime is 998266757. The reversal of 998266691 is 196662899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998266691 - 2¹⁸ = 998004547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998266601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499133345 + 499133346.

It is an arithmetic number, because the mean of its divisors is an integer number (499133346).

Almost surely, 2^998266691 is an apocalyptic number.

998266691 is a deficient number, since it is larger than the sum of its proper divisors (1).

998266691 is an equidigital number, since it uses as much as digits as its factorization.

998266691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 998266691 is about 31595.3586939601. The cubic root of 998266691 is about 999.4218961937.

The spelling of 998266691 in words is "nine hundred ninety-eight million, two hundred sixty-six thousand, six hundred ninety-one".