998591567 has 2 divisors, whose sum is σ = 998591568. Its totient is φ = 998591566.

The previous prime is 998591549. The next prime is 998591591. The reversal of 998591567 is 765195899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998591567 - 2¹⁶ = 998526031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998591467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499295783 + 499295784.

It is an arithmetic number, because the mean of its divisors is an integer number (499295784).

Almost surely, 2^998591567 is an apocalyptic number.

998591567 is a deficient number, since it is larger than the sum of its proper divisors (1).

998591567 is an equidigital number, since it uses as much as digits as its factorization.

998591567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 59.

The square root of 998591567 is about 31600.4994739007. The cubic root of 998591567 is about 999.5303017514.

The spelling of 998591567 in words is "nine hundred ninety-eight million, five hundred ninety-one thousand, five hundred sixty-seven".