73841821 has 2 divisors, whose sum is σ = 73841822. Its totient is φ = 73841820.

The previous prime is 73841819. The next prime is 73841827. The reversal of 73841821 is 12814837.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 19980900 = 7339^2 + 4470^2 .

It is a cyclic number.

It is not a de Polignac number, because 73841821 - 2¹ = 73841819 is a prime.

It is a super-2 number, since 2×73841821² = 10905229057192082, which contains 22 as substring.

Together with 73841819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73841827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36920910 + 36920911.

It is an arithmetic number, because the mean of its divisors is an integer number (36920911).

Almost surely, 2^73841821 is an apocalyptic number.

It is an amenable number.

73841821 is a deficient number, since it is larger than the sum of its proper divisors (1).

73841821 is an equidigital number, since it uses as much as digits as its factorization.

73841821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 73841821 is about 8593.1263810094. The cubic root of 73841821 is about 419.5342929485.

The spelling of 73841821 in words is "seventy-three million, eight hundred forty-one thousand, eight hundred twenty-one".