998370691 has 2 divisors, whose sum is σ = 998370692. Its totient is φ = 998370690.

The previous prime is 998370647. The next prime is 998370719. The reversal of 998370691 is 196073899.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998370691 is a prime.

It is not a weakly prime, because it can be changed into another prime (998370631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499185345 + 499185346.

It is an arithmetic number, because the mean of its divisors is an integer number (499185346).

Almost surely, 2^998370691 is an apocalyptic number.

998370691 is a deficient number, since it is larger than the sum of its proper divisors (1).

998370691 is an equidigital number, since it uses as much as digits as its factorization.

998370691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 998370691 is about 31597.0044624487. The cubic root of 998370691 is about 999.4566017719.

The spelling of 998370691 in words is "nine hundred ninety-eight million, three hundred seventy thousand, six hundred ninety-one".