4145521 has 4 divisors (see below), whose sum is σ = 4288500. Its totient is φ = 4002544.

The previous prime is 4145509. The next prime is 4145527. The reversal of 4145521 is 1255414.

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 2143296 + 2002225 = 1464^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 4145521 - 2¹⁵ = 4112753 is a prime.

It is a super-2 number, since 2×4145521² = 34370688722882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4145492 and 4145501.

It is not an unprimeable number, because it can be changed into a prime (4145527) 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, 71446 + ... + 71503.

It is an arithmetic number, because the mean of its divisors is an integer number (1072125).

Almost surely, 2^4145521 is an apocalyptic number.

It is an amenable number.

4145521 is a deficient number, since it is larger than the sum of its proper divisors (142979).

4145521 is a wasteful number, since it uses less digits than its factorization.

4145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142978.

The product of its digits is 800, while the sum is 22.

The square root of 4145521 is about 2036.0552546530. The cubic root of 4145521 is about 160.6422234202.

The spelling of 4145521 in words is "four million, one hundred forty-five thousand, five hundred twenty-one".