2138561275 has 24 divisors (see below), whose sum is σ = 2808463104. Its totient is φ = 1612010400.

The previous prime is 2138561267. The next prime is 2138561279. The reversal of 2138561275 is 5721658312.

It is not a de Polignac number, because 2138561275 - 2³ = 2138561267 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2138561279) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10770 + ... + 66280.

It is an arithmetic number, because the mean of its divisors is an integer number (117019296).

Almost surely, 2^2138561275 is an apocalyptic number.

2138561275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2138561275 is a deficient number, since it is larger than the sum of its proper divisors (669901829).

2138561275 is a wasteful number, since it uses less digits than its factorization.

2138561275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55611 (or 55606 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 2138561275 is about 46244.5810338898. The cubic root of 2138561275 is about 1288.3698887738.

The spelling of 2138561275 in words is "two billion, one hundred thirty-eight million, five hundred sixty-one thousand, two hundred seventy-five".