4791581 has 4 divisors (see below), whose sum is σ = 4819452. Its totient is φ = 4763712.

The previous prime is 4791559. The next prime is 4791623. The reversal of 4791581 is 1851974.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1851974 = 2 ⋅925987.

It can be written as a sum of positive squares in 2 ways, for example, as 1932100 + 2859481 = 1390^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 4791581 - 2⁶ = 4791517 is a prime.

It is a super-2 number, since 2×4791581² = 45918496959122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4791511) 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, 13676 + ... + 14021.

It is an arithmetic number, because the mean of its divisors is an integer number (1204863).

Almost surely, 2^4791581 is an apocalyptic number.

It is an amenable number.

4791581 is a deficient number, since it is larger than the sum of its proper divisors (27871).

4791581 is a wasteful number, since it uses less digits than its factorization.

4791581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27870.

The product of its digits is 10080, while the sum is 35.

The square root of 4791581 is about 2188.9680216942. The cubic root of 4791581 is about 168.5878522937.

The spelling of 4791581 in words is "four million, seven hundred ninety-one thousand, five hundred eighty-one".