2131524 has 18 divisors (see below), whose sum is σ = 5388110. Its totient is φ = 710496.

The previous prime is 2131517. The next prime is 2131531. The reversal of 2131524 is 4251312.

It is an interprime number because it is at equal distance from previous prime (2131517) and next prime (2131531).

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 260100 = 1368^2 + 510^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2131497 and 2131506.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29569 + ... + 29640.

2^2131524 is an apocalyptic number.

It is an amenable number.

2131524 is an abundant number, since it is smaller than the sum of its proper divisors (3256586).

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

2131524 is a wasteful number, since it uses less digits than its factorization.

2131524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59219 (or 59214 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2131524 is about 1459.9739723707. The cubic root of 2131524 is about 128.6955140678.

Adding to 2131524 its reverse (4251312), we get a palindrome (6382836).

The spelling of 2131524 in words is "two million, one hundred thirty-one thousand, five hundred twenty-four".