2138532481 has 4 divisors (see below), whose sum is σ = 2141858992. Its totient is φ = 2135205972.

The previous prime is 2138532397. The next prime is 2138532491. The reversal of 2138532481 is 1842358312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2138532481 - 2¹⁷ = 2138401409 is a prime.

It is a super-2 number, since 2×2138532481² = 9146642344584030722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138532481.

It is not an unprimeable number, because it can be changed into a prime (2138532491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662291 + ... + 1663576.

It is an arithmetic number, because the mean of its divisors is an integer number (535464748).

Almost surely, 2^2138532481 is an apocalyptic number.

It is an amenable number.

2138532481 is a deficient number, since it is larger than the sum of its proper divisors (3326511).

2138532481 is an equidigital number, since it uses as much as digits as its factorization.

2138532481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326510.

The product of its digits is 46080, while the sum is 37.

The square root of 2138532481 is about 46244.2697098787. The cubic root of 2138532481 is about 1288.3641064612.

The spelling of 2138532481 in words is "two billion, one hundred thirty-eight million, five hundred thirty-two thousand, four hundred eighty-one".