4091168581 has 2 divisors, whose sum is σ = 4091168582. Its totient is φ = 4091168580.

The previous prime is 4091168579. The next prime is 4091168657. The reversal of 4091168581 is 1858611904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3157316100 + 933852481 = 56190^2 + 30559^2 .

It is a cyclic number.

It is not a de Polignac number, because 4091168581 - 2¹ = 4091168579 is a prime.

It is a super-2 number, since 2×4091168581² = 33475320716323107122, which contains 22 as substring.

Together with 4091168579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4091168531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2045584290 + 2045584291.

It is an arithmetic number, because the mean of its divisors is an integer number (2045584291).

Almost surely, 2^4091168581 is an apocalyptic number.

It is an amenable number.

4091168581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4091168581 is an equidigital number, since it uses as much as digits as its factorization.

4091168581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 4091168581 is about 63962.2434018695. The cubic root of 4091168581 is about 1599.3706614750.

The spelling of 4091168581 in words is "four billion, ninety-one million, one hundred sixty-eight thousand, five hundred eighty-one".