4921800181 has 2 divisors, whose sum is σ = 4921800182. Its totient is φ = 4921800180.

The previous prime is 4921800131. The next prime is 4921800217. The reversal of 4921800181 is 1810081294.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4094720100 + 827080081 = 63990^2 + 28759^2 .

It is a cyclic number.

It is not a de Polignac number, because 4921800181 - 2⁷ = 4921800053 is a prime.

It is a super-2 number, since 2×4921800181² = 48448234043383265522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4921800131) 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 as a sum of consecutive naturals, namely, 2460900090 + 2460900091.

It is an arithmetic number, because the mean of its divisors is an integer number (2460900091).

Almost surely, 2^4921800181 is an apocalyptic number.

It is an amenable number.

4921800181 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921800181 is an equidigital number, since it uses as much as digits as its factorization.

4921800181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 4921800181 is about 70155.5427674820. The cubic root of 4921800181 is about 1701.0144096792.

The spelling of 4921800181 in words is "four billion, nine hundred twenty-one million, eight hundred thousand, one hundred eighty-one".