897217702091 has 2 divisors, whose sum is σ = 897217702092. Its totient is φ = 897217702090.

The previous prime is 897217702081. The next prime is 897217702301. The reversal of 897217702091 is 190207712798.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 897217702091 - 2²² = 897213507787 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (897217702081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448608851045 + 448608851046.

It is an arithmetic number, because the mean of its divisors is an integer number (448608851046).

Almost surely, 2^897217702091 is an apocalyptic number.

897217702091 is a deficient number, since it is larger than the sum of its proper divisors (1).

897217702091 is an equidigital number, since it uses as much as digits as its factorization.

897217702091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 53.

The spelling of 897217702091 in words is "eight hundred ninety-seven billion, two hundred seventeen million, seven hundred two thousand, ninety-one".