897767813 has 2 divisors, whose sum is σ = 897767814. Its totient is φ = 897767812.

The previous prime is 897767791. The next prime is 897767833. The reversal of 897767813 is 318767798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537451489 + 360316324 = 23183^2 + 18982^2 .

It is a cyclic number.

It is not a de Polignac number, because 897767813 - 2¹² = 897763717 is a prime.

It is a Sophie Germain 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 (897767833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448883906 + 448883907.

It is an arithmetic number, because the mean of its divisors is an integer number (448883907).

Almost surely, 2^897767813 is an apocalyptic number.

It is an amenable number.

897767813 is a deficient number, since it is larger than the sum of its proper divisors (1).

897767813 is an equidigital number, since it uses as much as digits as its factorization.

897767813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 56.

The square root of 897767813 is about 29962.7737868175. The cubic root of 897767813 is about 964.6905190299.

The spelling of 897767813 in words is "eight hundred ninety-seven million, seven hundred sixty-seven thousand, eight hundred thirteen".