7541221 has 4 divisors (see below), whose sum is σ = 7548652. Its totient is φ = 7533792.

The previous prime is 7541213. The next prime is 7541227. The reversal of 7541221 is 1221457.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2528100 + 5013121 = 1590^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 7541221 - 2³ = 7541213 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7541192 and 7541201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7541227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1896 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (1887163).

Almost surely, 2^7541221 is an apocalyptic number.

It is an amenable number.

7541221 is a deficient number, since it is larger than the sum of its proper divisors (7431).

7541221 is a wasteful number, since it uses less digits than its factorization.

7541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430.

The product of its digits is 560, while the sum is 22.

The square root of 7541221 is about 2746.1283655357. The cubic root of 7541221 is about 196.1013376423.

Adding to 7541221 its reverse (1221457), we get a palindrome (8762678).

The spelling of 7541221 in words is "seven million, five hundred forty-one thousand, two hundred twenty-one".