897201091 has 2 divisors, whose sum is σ = 897201092. Its totient is φ = 897201090.

The previous prime is 897201077. The next prime is 897201103. The reversal of 897201091 is 190102798.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 897201091 - 2⁵ = 897201059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 897201091.

It is not a weakly prime, because it can be changed into another prime (897201031) 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, 448600545 + 448600546.

It is an arithmetic number, because the mean of its divisors is an integer number (448600546).

Almost surely, 2^897201091 is an apocalyptic number.

897201091 is a deficient number, since it is larger than the sum of its proper divisors (1).

897201091 is an equidigital number, since it uses as much as digits as its factorization.

897201091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 897201091 is about 29953.3151921453. The cubic root of 897201091 is about 964.4874871654.

The spelling of 897201091 in words is "eight hundred ninety-seven million, two hundred one thousand, ninety-one".