4145111521 has 4 divisors (see below), whose sum is σ = 4246211844. Its totient is φ = 4044011200.

The previous prime is 4145111519. The next prime is 4145111567. The reversal of 4145111521 is 1251115414.

It is a happy number.

4145111521 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244484496 + 3900627025 = 15636^2 + 62455^2 .

It is a cyclic number.

It is not a de Polignac number, because 4145111521 - 2¹ = 4145111519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4145111501) 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, 50550100 + ... + 50550181.

It is an arithmetic number, because the mean of its divisors is an integer number (1061552961).

Almost surely, 2^4145111521 is an apocalyptic number.

4145111521 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4145111521 is a deficient number, since it is larger than the sum of its proper divisors (101100323).

4145111521 is a wasteful number, since it uses less digits than its factorization.

4145111521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101100322.

The product of its digits is 800, while the sum is 25.

The square root of 4145111521 is about 64382.5404981816. The cubic root of 4145111521 is about 1606.3693403415.

Adding to 4145111521 its reverse (1251115414), we get a palindrome (5396226935).

The spelling of 4145111521 in words is "four billion, one hundred forty-five million, one hundred eleven thousand, five hundred twenty-one".