2155318397 has 8 divisors (see below), whose sum is σ = 2174416896. Its totient is φ = 2136253392.

The previous prime is 2155318379. The next prime is 2155318411. The reversal of 2155318397 is 7938135512.

2155318397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2155318397 - 2⁸ = 2155318141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155348397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131048 + ... + 146574.

It is an arithmetic number, because the mean of its divisors is an integer number (271802112).

Almost surely, 2^2155318397 is an apocalyptic number.

It is an amenable number.

2155318397 is a deficient number, since it is larger than the sum of its proper divisors (19098499).

2155318397 is a wasteful number, since it uses less digits than its factorization.

2155318397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16747.

The product of its digits is 226800, while the sum is 44.

The square root of 2155318397 is about 46425.4068048951. The cubic root of 2155318397 is about 1291.7262303456.

The spelling of 2155318397 in words is "two billion, one hundred fifty-five million, three hundred eighteen thousand, three hundred ninety-seven".