2181016397 has 8 divisors (see below), whose sum is σ = 2497022016. Its totient is φ = 1866118752.

The previous prime is 2181016391. The next prime is 2181016399. The reversal of 2181016397 is 7936101812.

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

It is a cyclic number.

It is not a de Polignac number, because 2181016397 - 2⁶ = 2181016333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2181016397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181016391) 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 7 ways as a sum of consecutive naturals, for example, 272768 + ... + 280649.

It is an arithmetic number, because the mean of its divisors is an integer number (312127752).

Almost surely, 2^2181016397 is an apocalyptic number.

It is an amenable number.

2181016397 is a deficient number, since it is larger than the sum of its proper divisors (316005619).

2181016397 is an equidigital number, since it uses as much as digits as its factorization.

2181016397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553987.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 2181016397 is about 46701.3532673305. The cubic root of 2181016397 is about 1296.8397393090.

The spelling of 2181016397 in words is "two billion, one hundred eighty-one million, sixteen thousand, three hundred ninety-seven".