897181181 has 4 divisors (see below), whose sum is σ = 966195132. Its totient is φ = 828167232.

The previous prime is 897181157. The next prime is 897181183. The reversal of 897181181 is 181181798.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 430189081 + 466992100 = 20741^2 + 21610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897181181 is a prime.

It is a super-2 number, since 2×897181181² = 1609868143081109522, 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 (897181183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34506956 + ... + 34506981.

It is an arithmetic number, because the mean of its divisors is an integer number (241548783).

Almost surely, 2^897181181 is an apocalyptic number.

It is an amenable number.

897181181 is a deficient number, since it is larger than the sum of its proper divisors (69013951).

897181181 is a wasteful number, since it uses less digits than its factorization.

897181181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69013950.

The product of its digits is 32256, while the sum is 44.

The square root of 897181181 is about 29952.9828397774. The cubic root of 897181181 is about 964.4803527232.

The spelling of 897181181 in words is "eight hundred ninety-seven million, one hundred eighty-one thousand, one hundred eighty-one".