7541661 has 4 divisors (see below), whose sum is σ = 10055552. Its totient is φ = 5027772.

The previous prime is 7541647. The next prime is 7541669. The reversal of 7541661 is 1661457.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7541661 - 2⁷ = 7541533 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 (7541669) 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, 1256941 + ... + 1256946.

It is an arithmetic number, because the mean of its divisors is an integer number (2513888).

Almost surely, 2^7541661 is an apocalyptic number.

It is an amenable number.

7541661 is a deficient number, since it is larger than the sum of its proper divisors (2513891).

7541661 is a wasteful number, since it uses less digits than its factorization.

7541661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2513890.

The product of its digits is 5040, while the sum is 30.

The square root of 7541661 is about 2746.2084771554. The cubic root of 7541661 is about 196.1051514770.

It can be divided in two parts, 754 and 1661, that added together give a triangular number (2415 = T₆₉).

The spelling of 7541661 in words is "seven million, five hundred forty-one thousand, six hundred sixty-one".