4251818181 has 16 divisors (see below), whose sum is σ = 6109248320. Its totient is φ = 2614757760.

The previous prime is 4251818177. The next prime is 4251818183. The reversal of 4251818181 is 1818181524.

It is not a de Polignac number, because 4251818181 - 2² = 4251818177 is a prime.

It is a super-2 number, since 2×4251818181² = 36155915688564297522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4251818183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24105 + ... + 95313.

It is an arithmetic number, because the mean of its divisors is an integer number (381828020).

Almost surely, 2^4251818181 is an apocalyptic number.

It is an amenable number.

4251818181 is a deficient number, since it is larger than the sum of its proper divisors (1857430139).

4251818181 is a wasteful number, since it uses less digits than its factorization.

4251818181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72756.

The product of its digits is 20480, while the sum is 39.

The square root of 4251818181 is about 65205.9673726263. The cubic root of 4251818181 is about 1620.0368559669.

The spelling of 4251818181 in words is "four billion, two hundred fifty-one million, eight hundred eighteen thousand, one hundred eighty-one".