2138572791 has 12 divisors (see below), whose sum is σ = 3090709440. Its totient is φ = 1424949120.

The previous prime is 2138572763. The next prime is 2138572801. The reversal of 2138572791 is 1972758312.

2138572791 is a `hidden beast` number, since 2 + 1 + 3 + 8 + 572 + 79 + 1 = 666.

It is not a de Polignac number, because 2138572791 - 2⁹ = 2138572279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138572391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45895 + ... + 79896.

It is an arithmetic number, because the mean of its divisors is an integer number (257559120).

Almost surely, 2^2138572791 is an apocalyptic number.

2138572791 is a deficient number, since it is larger than the sum of its proper divisors (952136649).

2138572791 is a wasteful number, since it uses less digits than its factorization.

2138572791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127686 (or 127683 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 2138572791 is about 46244.7055456081. The cubic root of 2138572791 is about 1288.3722013630.

The spelling of 2138572791 in words is "two billion, one hundred thirty-eight million, five hundred seventy-two thousand, seven hundred ninety-one".