897974181 has 56 divisors (see below), whose sum is σ = 1526527520. Its totient is φ = 523410336.

The previous prime is 897974171. The next prime is 897974243. The reversal of 897974181 is 181479798.

It is not a de Polignac number, because 897974181 - 2⁹ = 897973669 is a prime.

It is a super-2 number, since 2×897974181² = 1612715259485241522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897974141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 177570 + ... + 182556.

It is an arithmetic number, because the mean of its divisors is an integer number (27259420).

Almost surely, 2^897974181 is an apocalyptic number.

897974181 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

897974181 is a deficient number, since it is larger than the sum of its proper divisors (628553339).

897974181 is a wasteful number, since it uses less digits than its factorization.

897974181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037 (or 5022 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 897974181 is about 29966.2173288522. The cubic root of 897974181 is about 964.7644304942.

The spelling of 897974181 in words is "eight hundred ninety-seven million, nine hundred seventy-four thousand, one hundred eighty-one".