7545661 has 4 divisors (see below), whose sum is σ = 7554652. Its totient is φ = 7536672.

The previous prime is 7545653. The next prime is 7545689. The reversal of 7545661 is 1665457.

It is a happy number.

7545661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1665457 = 89 ⋅18713.

It can be written as a sum of positive squares in 2 ways, for example, as 2788900 + 4756761 = 1670^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 7545661 - 2³ = 7545653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7545611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3090 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (1888663).

Almost surely, 2^7545661 is an apocalyptic number.

It is an amenable number.

7545661 is a deficient number, since it is larger than the sum of its proper divisors (8991).

7545661 is an equidigital number, since it uses as much as digits as its factorization.

7545661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990.

The product of its digits is 25200, while the sum is 34.

The square root of 7545661 is about 2746.9366574422. The cubic root of 7545661 is about 196.1398158993.

The spelling of 7545661 in words is "seven million, five hundred forty-five thousand, six hundred sixty-one".