897542991 has 8 divisors (see below), whose sum is σ = 1329693360. Its totient is φ = 598361976.

The previous prime is 897542983. The next prime is 897543001. The reversal of 897542991 is 199245798.

897542991 is a `hidden beast` number, since 8 + 9 + 7 + 542 + 9 + 91 = 666.

It is not a de Polignac number, because 897542991 - 2³ = 897542983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897542911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16621140 + ... + 16621193.

It is an arithmetic number, because the mean of its divisors is an integer number (166211670).

Almost surely, 2^897542991 is an apocalyptic number.

897542991 is a deficient number, since it is larger than the sum of its proper divisors (432150369).

897542991 is a wasteful number, since it uses less digits than its factorization.

897542991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33242342 (or 33242336 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 897542991 is about 29959.0218632051. The cubic root of 897542991 is about 964.6099853049.

The spelling of 897542991 in words is "eight hundred ninety-seven million, five hundred forty-two thousand, nine hundred ninety-one".