4181561191 has 2 divisors, whose sum is σ = 4181561192. Its totient is φ = 4181561190.

The previous prime is 4181561149. The next prime is 4181561239. The reversal of 4181561191 is 1911651814.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4181561191 - 2⁷ = 4181561063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4181561191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4181561141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090780595 + 2090780596.

It is an arithmetic number, because the mean of its divisors is an integer number (2090780596).

Almost surely, 2^4181561191 is an apocalyptic number.

4181561191 is a deficient number, since it is larger than the sum of its proper divisors (1).

4181561191 is an equidigital number, since it uses as much as digits as its factorization.

4181561191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 37.

The square root of 4181561191 is about 64664.9920049481. The cubic root of 4181561191 is about 1611.0640948519.

The spelling of 4181561191 in words is "four billion, one hundred eighty-one million, five hundred sixty-one thousand, one hundred ninety-one".