2131530 has 32 divisors (see below), whose sum is σ = 5154624. Its totient is φ = 564096.

The previous prime is 2131517. The next prime is 2131531. The reversal of 2131530 is 351312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 15 ways as a sum of consecutive naturals, for example, 6654 + ... + 6966.

It is an arithmetic number, because the mean of its divisors is an integer number (161082).

2^2131530 is an apocalyptic number.

2131530 is an abundant number, since it is smaller than the sum of its proper divisors (3023094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131530 is a wasteful number, since it uses less digits than its factorization.

2131530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 2131530 is about 1459.9760272004. The cubic root of 2131530 is about 128.6956348222.

Adding to 2131530 its reverse (351312), we get a palindrome (2482842).

The spelling of 2131530 in words is "two million, one hundred thirty-one thousand, five hundred thirty".