7521641 has 2 divisors, whose sum is σ = 7521642. Its totient is φ = 7521640.

The previous prime is 7521617. The next prime is 7521649. The reversal of 7521641 is 1461257.

7521641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 1371241 = 2480^2 + 1171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7521641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7521641.

It is not a weakly prime, because it can be changed into another prime (7521649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3760820 + 3760821.

It is an arithmetic number, because the mean of its divisors is an integer number (3760821).

Almost surely, 2^7521641 is an apocalyptic number.

It is an amenable number.

7521641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7521641 is an equidigital number, since it uses as much as digits as its factorization.

7521641 is an evil number, because the sum of its binary digits is even.

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

The square root of 7521641 is about 2742.5610294030. The cubic root of 7521641 is about 195.9314716003.

Adding to 7521641 its reverse (1461257), we get a palindrome (8982898).

It can be divided in two parts, 75216 and 41, that added together give a palindrome (75257).

The spelling of 7521641 in words is "seven million, five hundred twenty-one thousand, six hundred forty-one".