2181069897 has 16 divisors (see below), whose sum is σ = 2934662400. Its totient is φ = 1440809600.

The previous prime is 2181069889. The next prime is 2181069899. The reversal of 2181069897 is 7989601812.

It is a cyclic number.

It is not a de Polignac number, because 2181069897 - 2³ = 2181069889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2181069899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186997 + ... + 198317.

It is an arithmetic number, because the mean of its divisors is an integer number (183416400).

Almost surely, 2^2181069897 is an apocalyptic number.

It is an amenable number.

2181069897 is a deficient number, since it is larger than the sum of its proper divisors (753592503).

2181069897 is a wasteful number, since it uses less digits than its factorization.

2181069897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11904.

The product of its (nonzero) digits is 435456, while the sum is 51.

The square root of 2181069897 is about 46701.9260523589. The cubic root of 2181069897 is about 1296.8503429827.

The spelling of 2181069897 in words is "two billion, one hundred eighty-one million, sixty-nine thousand, eight hundred ninety-seven".