7641521 has 4 divisors (see below), whose sum is σ = 7658352. Its totient is φ = 7624692.

The previous prime is 7641511. The next prime is 7641527. The reversal of 7641521 is 1251467.

7641521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1251467 = 7 ⋅178781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7641521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7641527) 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, 7715 + ... + 8648.

It is an arithmetic number, because the mean of its divisors is an integer number (1914588).

Almost surely, 2^7641521 is an apocalyptic number.

It is an amenable number.

7641521 is a deficient number, since it is larger than the sum of its proper divisors (16831).

7641521 is a wasteful number, since it uses less digits than its factorization.

7641521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16830.

The product of its digits is 1680, while the sum is 26.

The square root of 7641521 is about 2764.3301177681. The cubic root of 7641521 is about 196.9669093329.

Adding to 7641521 its reverse (1251467), we get a palindrome (8892988).

The spelling of 7641521 in words is "seven million, six hundred forty-one thousand, five hundred twenty-one".