816734549 has 2 divisors, whose sum is σ = 816734550. Its totient is φ = 816734548.

The previous prime is 816734543. The next prime is 816734573. The reversal of 816734549 is 945437618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450203524 + 366531025 = 21218^2 + 19145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816734549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816734543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408367274 + 408367275.

It is an arithmetic number, because the mean of its divisors is an integer number (408367275).

Almost surely, 2^816734549 is an apocalyptic number.

It is an amenable number.

816734549 is a deficient number, since it is larger than the sum of its proper divisors (1).

816734549 is an equidigital number, since it uses as much as digits as its factorization.

816734549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 816734549 is about 28578.5680012138. The cubic root of 816734549 is about 934.7460581780.

The spelling of 816734549 in words is "eight hundred sixteen million, seven hundred thirty-four thousand, five hundred forty-nine".