897121647 has 24 divisors (see below), whose sum is σ = 1388740704. Its totient is φ = 556611264.

The previous prime is 897121607. The next prime is 897121681. The reversal of 897121647 is 746121798.

It is a happy number.

It is not a de Polignac number, because 897121647 - 2⁸ = 897121391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897121607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50908 + ... + 66225.

It is an arithmetic number, because the mean of its divisors is an integer number (57864196).

Almost surely, 2^897121647 is an apocalyptic number.

897121647 is a deficient number, since it is larger than the sum of its proper divisors (491619057).

897121647 is a wasteful number, since it uses less digits than its factorization.

897121647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117199 (or 117196 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 897121647 is about 29951.9890324499. The cubic root of 897121647 is about 964.4590190005.

The spelling of 897121647 in words is "eight hundred ninety-seven million, one hundred twenty-one thousand, six hundred forty-seven".