897948091 has 2 divisors, whose sum is σ = 897948092. Its totient is φ = 897948090.

The previous prime is 897948071. The next prime is 897948097. The reversal of 897948091 is 190849798.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 897948091 - 2²¹ = 895850939 is a prime.

It is not a weakly prime, because it can be changed into another prime (897948097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448974045 + 448974046.

It is an arithmetic number, because the mean of its divisors is an integer number (448974046).

Almost surely, 2^897948091 is an apocalyptic number.

897948091 is a deficient number, since it is larger than the sum of its proper divisors (1).

897948091 is an equidigital number, since it uses as much as digits as its factorization.

897948091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 897948091 is about 29965.7820021437. The cubic root of 897948091 is about 964.7550868893.

The spelling of 897948091 in words is "eight hundred ninety-seven million, nine hundred forty-eight thousand, ninety-one".