4172640581 has 2 divisors, whose sum is σ = 4172640582. Its totient is φ = 4172640580.

The previous prime is 4172640569. The next prime is 4172640601. The reversal of 4172640581 is 1850462714.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3402855556 + 769785025 = 58334^2 + 27745^2 .

It is a cyclic number.

It is not a de Polignac number, because 4172640581 - 2¹⁰ = 4172639557 is a prime.

It is a super-2 number, since 2×4172640581² = 34821858836416035122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4172640281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2086320290 + 2086320291.

It is an arithmetic number, because the mean of its divisors is an integer number (2086320291).

Almost surely, 2^4172640581 is an apocalyptic number.

It is an amenable number.

4172640581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4172640581 is an equidigital number, since it uses as much as digits as its factorization.

4172640581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 4172640581 is about 64595.9796039970. The cubic root of 4172640581 is about 1609.9176405538.

The spelling of 4172640581 in words is "four billion, one hundred seventy-two million, six hundred forty thousand, five hundred eighty-one".