7621521 has 8 divisors (see below), whose sum is σ = 10176864. Its totient is φ = 5073600.

The previous prime is 7621517. The next prime is 7621541. The reversal of 7621521 is 1251267.

7621521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7621521 - 2² = 7621517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7621491 and 7621500.

It is not an unprimeable number, because it can be changed into a prime (7621541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1321 + ... + 4121.

It is an arithmetic number, because the mean of its divisors is an integer number (1272108).

Almost surely, 2^7621521 is an apocalyptic number.

It is an amenable number.

7621521 is a deficient number, since it is larger than the sum of its proper divisors (2555343).

7621521 is a wasteful number, since it uses less digits than its factorization.

7621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711.

The product of its digits is 840, while the sum is 24.

The square root of 7621521 is about 2760.7102347041. The cubic root of 7621521 is about 196.7949200140.

Adding to 7621521 its reverse (1251267), we get a palindrome (8872788).

The spelling of 7621521 in words is "seven million, six hundred twenty-one thousand, five hundred twenty-one".