4491867561 has 8 divisors (see below), whose sum is σ = 6050901024. Its totient is φ = 2963706240.

The previous prime is 4491867559. The next prime is 4491867563. The reversal of 4491867561 is 1657681944.

It is an interprime number because it is at equal distance from previous prime (4491867559) and next prime (4491867563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4491867561 - 2¹ = 4491867559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4491867563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7717695 + ... + 7718276.

It is an arithmetic number, because the mean of its divisors is an integer number (756362628).

Almost surely, 2^4491867561 is an apocalyptic number.

It is an amenable number.

4491867561 is a deficient number, since it is larger than the sum of its proper divisors (1559033463).

4491867561 is a wasteful number, since it uses less digits than its factorization.

4491867561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15436071.

The product of its digits is 1451520, while the sum is 51.

The square root of 4491867561 is about 67021.3962925274. The cubic root of 4491867561 is about 1649.9684794713.

The spelling of 4491867561 in words is "four billion, four hundred ninety-one million, eight hundred sixty-seven thousand, five hundred sixty-one".