4181654221 has 2 divisors, whose sum is σ = 4181654222. Its totient is φ = 4181654220.

The previous prime is 4181654161. The next prime is 4181654251. The reversal of 4181654221 is 1224561814.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2574446121 + 1607208100 = 50739^2 + 40090^2 .

It is a cyclic number.

It is not a de Polignac number, because 4181654221 - 2¹⁵ = 4181621453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4181654251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2090827110 + 2090827111.

It is an arithmetic number, because the mean of its divisors is an integer number (2090827111).

Almost surely, 2^4181654221 is an apocalyptic number.

It is an amenable number.

4181654221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4181654221 is an equidigital number, since it uses as much as digits as its factorization.

4181654221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 34.

The square root of 4181654221 is about 64665.7113236992. The cubic root of 4181654221 is about 1611.0760422382.

The spelling of 4181654221 in words is "four billion, one hundred eighty-one million, six hundred fifty-four thousand, two hundred twenty-one".