897171907 has 2 divisors, whose sum is σ = 897171908. Its totient is φ = 897171906.

The previous prime is 897171883. The next prime is 897171911. The reversal of 897171907 is 709171798.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897171907 is a prime.

It is not a weakly prime, because it can be changed into another prime (897171917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448585953 + 448585954.

It is an arithmetic number, because the mean of its divisors is an integer number (448585954).

Almost surely, 2^897171907 is an apocalyptic number.

897171907 is a deficient number, since it is larger than the sum of its proper divisors (1).

897171907 is an equidigital number, since it uses as much as digits as its factorization.

897171907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 222264, while the sum is 49.

The square root of 897171907 is about 29952.8280300876. The cubic root of 897171907 is about 964.4770294919.

The spelling of 897171907 in words is "eight hundred ninety-seven million, one hundred seventy-one thousand, nine hundred seven".