7521919441 has 3 divisors (see below), whose sum is σ = 7522006171. Its totient is φ = 7521832712.

The previous prime is 7521919439. The next prime is 7521919451. The reversal of 7521919441 is 1449191257.

The square root of 7521919441 is 86729.

It is a perfect power (a square), and thus also a powerful 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, and also an emirpimes, since its reverse is a distinct semiprime: 1449191257 = 9013 ⋅160789.

It can be written as a sum of positive squares in only one way, i.e., 4452759441 + 3069160000 = 66729^2 + 55400^2 .

It is not a de Polignac number, because 7521919441 - 2¹ = 7521919439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7521919411) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 43365 + ... + 130093.

Almost surely, 2^7521919441 is an apocalyptic number.

7521919441 is the 86729-th square number.

7521919441 is the 43365-th centered octagonal number.

It is an amenable number.

7521919441 is a deficient number, since it is larger than the sum of its proper divisors (86730).

7521919441 is an frugal number, since it uses more digits than its factorization.

7521919441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173458 (or 86729 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The cubic root of 7521919441 is about 1959.3388927669.

The spelling of 7521919441 in words is "seven billion, five hundred twenty-one million, nine hundred nineteen thousand, four hundred forty-one".