2181500897 has 8 divisors (see below), whose sum is σ = 2237431680. Its totient is φ = 2125806480.

The previous prime is 2181500891. The next prime is 2181500917. The reversal of 2181500897 is 7980051812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2181500897 - 2⁸ = 2181500641 is a prime.

It is a super-2 number, since 2×2181500897² = 9517892327223609218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181500891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40322 + ... + 77387.

It is an arithmetic number, because the mean of its divisors is an integer number (279678960).

Almost surely, 2^2181500897 is an apocalyptic number.

It is an amenable number.

2181500897 is a deficient number, since it is larger than the sum of its proper divisors (55930783).

2181500897 is a wasteful number, since it uses less digits than its factorization.

2181500897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118183.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 2181500897 is about 46706.5401951376. The cubic root of 2181500897 is about 1296.9357606463.

The spelling of 2181500897 in words is "two billion, one hundred eighty-one million, five hundred thousand, eight hundred ninety-seven".