816988741 has 2 divisors, whose sum is σ = 816988742. Its totient is φ = 816988740.

The previous prime is 816988717. The next prime is 816988751. The reversal of 816988741 is 147889618.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662856516 + 154132225 = 25746^2 + 12415^2 .

It is a cyclic number.

It is not a de Polignac number, because 816988741 - 2¹¹ = 816986693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816988751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408494370 + 408494371.

It is an arithmetic number, because the mean of its divisors is an integer number (408494371).

Almost surely, 2^816988741 is an apocalyptic number.

It is an amenable number.

816988741 is a deficient number, since it is larger than the sum of its proper divisors (1).

816988741 is an equidigital number, since it uses as much as digits as its factorization.

816988741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 52.

The square root of 816988741 is about 28583.0149039600. The cubic root of 816988741 is about 934.8430216792.

The spelling of 816988741 in words is "eight hundred sixteen million, nine hundred eighty-eight thousand, seven hundred forty-one".