2251521 has 6 divisors (see below), whose sum is σ = 3252210. Its totient is φ = 1501008.

The previous prime is 2251517. The next prime is 2251547. The reversal of 2251521 is 1251522.

2251521 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 2250000 + 1521 = 1500^2 + 39^2 .

It is not a de Polignac number, because 2251521 - 2² = 2251517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2251494 and 2251503.

It is not an unprimeable number, because it can be changed into a prime (2251511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 125076 + ... + 125093.

It is an arithmetic number, because the mean of its divisors is an integer number (542035).

2^2251521 is an apocalyptic number.

It is an amenable number.

2251521 is a deficient number, since it is larger than the sum of its proper divisors (1000689).

2251521 is a wasteful number, since it uses less digits than its factorization.

2251521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250175 (or 250172 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2251521 is about 1500.5069143459. The cubic root of 2251521 is about 131.0665900792.

Subtracting from 2251521 its reverse (1251522), we obtain a palindrome (999999).

It can be divided in two parts, 2251 and 521, that added together give a palindrome (2772).

The spelling of 2251521 in words is "two million, two hundred fifty-one thousand, five hundred twenty-one".