2138461791 has 8 divisors (see below), whose sum is σ = 2862377904. Its totient is φ = 1420093440.

The previous prime is 2138461771. The next prime is 2138461859. The reversal of 2138461791 is 1971648312.

It is a happy number.

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

It is not a de Polignac number, because 2138461791 - 2⁶ = 2138461727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138461771) 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, 1386040 + ... + 1387581.

It is an arithmetic number, because the mean of its divisors is an integer number (357797238).

Almost surely, 2^2138461791 is an apocalyptic number.

2138461791 is a deficient number, since it is larger than the sum of its proper divisors (723916113).

2138461791 is a wasteful number, since it uses less digits than its factorization.

2138461791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773881.

The product of its digits is 72576, while the sum is 42.

The square root of 2138461791 is about 46243.5053926495. The cubic root of 2138461791 is about 1288.3499105172.

The spelling of 2138461791 in words is "two billion, one hundred thirty-eight million, four hundred sixty-one thousand, seven hundred ninety-one".