998765611 has 2 divisors, whose sum is σ = 998765612. Its totient is φ = 998765610.

The previous prime is 998765567. The next prime is 998765671. The reversal of 998765611 is 116567899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998765611 - 2²¹ = 996668459 is a prime.

It is not a weakly prime, because it can be changed into another prime (998765671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499382805 + 499382806.

It is an arithmetic number, because the mean of its divisors is an integer number (499382806).

Almost surely, 2^998765611 is an apocalyptic number.

998765611 is a deficient number, since it is larger than the sum of its proper divisors (1).

998765611 is an equidigital number, since it uses as much as digits as its factorization.

998765611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 998765611 is about 31603.2531711531. The cubic root of 998765611 is about 999.5883675820.

The spelling of 998765611 in words is "nine hundred ninety-eight million, seven hundred sixty-five thousand, six hundred eleven".