897794015621 has 2 divisors, whose sum is σ = 897794015622. Its totient is φ = 897794015620.

The previous prime is 897794015603. The next prime is 897794015641. The reversal of 897794015621 is 126510497798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 814351027396 + 83442988225 = 902414^2 + 288865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897794015621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897794015641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448897007810 + 448897007811.

It is an arithmetic number, because the mean of its divisors is an integer number (448897007811).

Almost surely, 2^897794015621 is an apocalyptic number.

It is an amenable number.

897794015621 is a deficient number, since it is larger than the sum of its proper divisors (1).

897794015621 is an equidigital number, since it uses as much as digits as its factorization.

897794015621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 897794015621 in words is "eight hundred ninety-seven billion, seven hundred ninety-four million, fifteen thousand, six hundred twenty-one".