712776821 has 2 divisors, whose sum is σ = 712776822. Its totient is φ = 712776820.

The previous prime is 712776809. The next prime is 712776851. The reversal of 712776821 is 128677217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561216100 + 151560721 = 23690^2 + 12311^2 .

It is a cyclic number.

It is not a de Polignac number, because 712776821 - 2¹⁴ = 712760437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (712776851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356388410 + 356388411.

It is an arithmetic number, because the mean of its divisors is an integer number (356388411).

Almost surely, 2^712776821 is an apocalyptic number.

It is an amenable number.

712776821 is a deficient number, since it is larger than the sum of its proper divisors (1).

712776821 is an equidigital number, since it uses as much as digits as its factorization.

712776821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 41.

The square root of 712776821 is about 26697.8804589428. The cubic root of 712776821 is about 893.2736490007.

The spelling of 712776821 in words is "seven hundred twelve million, seven hundred seventy-six thousand, eight hundred twenty-one".