4115531521 has 2 divisors, whose sum is σ = 4115531522. Its totient is φ = 4115531520.

The previous prime is 4115531509. The next prime is 4115531527. The reversal of 4115531521 is 1251355114.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3936935025 + 178596496 = 62745^2 + 13364^2 .

It is a cyclic number.

It is not a de Polignac number, because 4115531521 - 2⁹ = 4115531009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4115531521.

It is not a weakly prime, because it can be changed into another prime (4115531527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2057765760 + 2057765761.

It is an arithmetic number, because the mean of its divisors is an integer number (2057765761).

Almost surely, 2^4115531521 is an apocalyptic number.

It is an amenable number.

4115531521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4115531521 is an equidigital number, since it uses as much as digits as its factorization.

4115531521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 28.

The square root of 4115531521 is about 64152.4085362350. The cubic root of 4115531521 is about 1602.5391351607.

Adding to 4115531521 its reverse (1251355114), we get a palindrome (5366886635).

The spelling of 4115531521 in words is "four billion, one hundred fifteen million, five hundred thirty-one thousand, five hundred twenty-one".