2531021 has 6 divisors (see below), whose sum is σ = 2566890. Its totient is φ = 2495616.

The previous prime is 2531017. The next prime is 2531027. The reversal of 2531021 is 1201352.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 15625 + 2515396 = 125^2 + 1586^2 .

It is not a de Polignac number, because 2531021 - 2² = 2531017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2530987 and 2531005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9275 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (427815).

2^2531021 is an apocalyptic number.

It is an amenable number.

2531021 is a deficient number, since it is larger than the sum of its proper divisors (35869).

2531021 is an frugal number, since it uses more digits than its factorization.

2531021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 2531021 is about 1590.9182882851. The cubic root of 2531021 is about 136.2799345052.

Adding to 2531021 its reverse (1201352), we get a palindrome (3732373).

The spelling of 2531021 in words is "two million, five hundred thirty-one thousand, twenty-one".