2131538 has 8 divisors (see below), whose sum is σ = 3245232. Its totient is φ = 1049796.

The previous prime is 2131537. The next prime is 2131541. The reversal of 2131538 is 8351312.

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

It is not an unprimeable number, because it can be changed into a prime (2131531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7820 + ... + 8087.

It is an arithmetic number, because the mean of its divisors is an integer number (405654).

2^2131538 is an apocalyptic number.

2131538 is a deficient number, since it is larger than the sum of its proper divisors (1113694).

2131538 is a wasteful number, since it uses less digits than its factorization.

2131538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976.

The product of its digits is 720, while the sum is 23.

The square root of 2131538 is about 1459.9787669689. The cubic root of 2131538 is about 128.6957958276.

The spelling of 2131538 in words is "two million, one hundred thirty-one thousand, five hundred thirty-eight".