7381661 has 4 divisors (see below), whose sum is σ = 8436192. Its totient is φ = 6327132.

The previous prime is 7381651. The next prime is 7381663. The reversal of 7381661 is 1661837.

7381661 is nontrivially palindromic in base 13.

7381661 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1661837 = 383 ⋅4339.

It is not a de Polignac number, because 7381661 - 2¹⁴ = 7365277 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 (7381663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527255 + ... + 527268.

It is an arithmetic number, because the mean of its divisors is an integer number (2109048).

Almost surely, 2^7381661 is an apocalyptic number.

It is an amenable number.

7381661 is a deficient number, since it is larger than the sum of its proper divisors (1054531).

7381661 is a wasteful number, since it uses less digits than its factorization.

7381661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054530.

The product of its digits is 6048, while the sum is 32.

The square root of 7381661 is about 2716.9212355164. The cubic root of 7381661 is about 194.7084048527.

The spelling of 7381661 in words is "seven million, three hundred eighty-one thousand, six hundred sixty-one".