998766731 has 2 divisors, whose sum is σ = 998766732. Its totient is φ = 998766730.

The previous prime is 998766721. The next prime is 998766733. The reversal of 998766731 is 137667899.

It is a strong prime.

It is an emirp because it is prime and its reverse (137667899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998766731 is a prime.

It is a super-2 number, since 2×998766731² = 1995069965904852722, which contains 22 as substring.

Together with 998766733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998766733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499383365 + 499383366.

It is an arithmetic number, because the mean of its divisors is an integer number (499383366).

Almost surely, 2^998766731 is an apocalyptic number.

998766731 is a deficient number, since it is larger than the sum of its proper divisors (1).

998766731 is an equidigital number, since it uses as much as digits as its factorization.

998766731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 998766731 is about 31603.2708908429. The cubic root of 998766731 is about 999.5887412227.

The spelling of 998766731 in words is "nine hundred ninety-eight million, seven hundred sixty-six thousand, seven hundred thirty-one".