7491665 has 4 divisors (see below), whose sum is σ = 8990004. Its totient is φ = 5993328.

The previous prime is 7491647. The next prime is 7491667. The reversal of 7491665 is 5661947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661947 = 419 ⋅13513.

It can be written as a sum of positive squares in 2 ways, for example, as 984064 + 6507601 = 992^2 + 2551^2 .

It is a cyclic number.

It is not a de Polignac number, because 7491665 - 2¹⁶ = 7426129 is a prime.

It is a super-2 number, since 2×7491665² = 112250088944450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7491667) 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, 749162 + ... + 749171.

It is an arithmetic number, because the mean of its divisors is an integer number (2247501).

Almost surely, 2^7491665 is an apocalyptic number.

It is an amenable number.

7491665 is a deficient number, since it is larger than the sum of its proper divisors (1498339).

7491665 is a wasteful number, since it uses less digits than its factorization.

7491665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498338.

The product of its digits is 45360, while the sum is 38.

The square root of 7491665 is about 2737.0906086573. The cubic root of 7491665 is about 195.6708431317.

The spelling of 7491665 in words is "seven million, four hundred ninety-one thousand, six hundred sixty-five".