816128743 has 2 divisors, whose sum is σ = 816128744. Its totient is φ = 816128742.

The previous prime is 816128693. The next prime is 816128767. The reversal of 816128743 is 347821618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816128743 is a prime.

It is a super-2 number, since 2×816128743² = 1332132250301520098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816128696 and 816128705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816120743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408064371 + 408064372.

It is an arithmetic number, because the mean of its divisors is an integer number (408064372).

Almost surely, 2^816128743 is an apocalyptic number.

816128743 is a deficient number, since it is larger than the sum of its proper divisors (1).

816128743 is an equidigital number, since it uses as much as digits as its factorization.

816128743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 816128743 is about 28567.9670785305. The cubic root of 816128743 is about 934.5148876633.

The spelling of 816128743 in words is "eight hundred sixteen million, one hundred twenty-eight thousand, seven hundred forty-three".