2158438311 has 6 divisors (see below), whose sum is σ = 3117744240. Its totient is φ = 1438958868.

The previous prime is 2158438309. The next prime is 2158438319. The reversal of 2158438311 is 1138348512.

2158438311 is a `hidden beast` number, since 215 + 8 + 438 + 3 + 1 + 1 = 666.

It is not a de Polignac number, because 2158438311 - 2¹ = 2158438309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158438319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119913231 + ... + 119913248.

It is an arithmetic number, because the mean of its divisors is an integer number (519624040).

Almost surely, 2^2158438311 is an apocalyptic number.

2158438311 is a deficient number, since it is larger than the sum of its proper divisors (959305929).

2158438311 is a wasteful number, since it uses less digits than its factorization.

2158438311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239826485 (or 239826482 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2158438311 is about 46458.9960179942. The cubic root of 2158438311 is about 1292.3492058575.

It can be divided in two parts, 21584 and 38311, that added together give a palindrome (59895).

The spelling of 2158438311 in words is "two billion, one hundred fifty-eight million, four hundred thirty-eight thousand, three hundred eleven".