4191809261 has 2 divisors, whose sum is σ = 4191809262. Its totient is φ = 4191809260.

The previous prime is 4191809249. The next prime is 4191809269. The reversal of 4191809261 is 1629081914.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3720268036 + 471541225 = 60994^2 + 21715^2 .

It is a cyclic number.

It is not a de Polignac number, because 4191809261 - 2¹⁴ = 4191792877 is a prime.

It is a super-2 number, since 2×4191809261² = 35142529761210732242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4191809269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2095904630 + 2095904631.

It is an arithmetic number, because the mean of its divisors is an integer number (2095904631).

Almost surely, 2^4191809261 is an apocalyptic number.

It is an amenable number.

4191809261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4191809261 is an equidigital number, since it uses as much as digits as its factorization.

4191809261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 4191809261 is about 64744.1832213520. The cubic root of 4191809261 is about 1612.3791402395.

The spelling of 4191809261 in words is "four billion, one hundred ninety-one million, eight hundred nine thousand, two hundred sixty-one".