3661525 has 30 divisors (see below), whose sum is σ = 5383522. Its totient is φ = 2469600.

The previous prime is 3661517. The next prime is 3661529. The reversal of 3661525 is 5251663.

It can be written as a sum of positive squares in 3 ways, for example, as 9604 + 3651921 = 98^2 + 1911^2 .

It is not a de Polignac number, because 3661525 - 2³ = 3661517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3661493 and 3661502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661529) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 59995 + ... + 60055.

Almost surely, 2^3661525 is an apocalyptic number.

3661525 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3661525 is a deficient number, since it is larger than the sum of its proper divisors (1721997).

3661525 is an frugal number, since it uses more digits than its factorization.

3661525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 73 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 3661525 is about 1913.5111705971. The cubic root of 3661525 is about 154.1300554245.

It can be divided in two parts, 3661 and 525, that added together give a triangular number (4186 = T₉₁).

The spelling of 3661525 in words is "three million, six hundred sixty-one thousand, five hundred twenty-five".