73402181 has 2 divisors, whose sum is σ = 73402182. Its totient is φ = 73402180.

The previous prime is 73402171. The next prime is 73402183. The reversal of 73402181 is 18120437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 982081 = 8510^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 73402181 - 2¹⁰ = 73401157 is a prime.

It is a super-2 number, since 2×73402181² = 10775760351113522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 73402183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73402181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73402183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36701090 + 36701091.

It is an arithmetic number, because the mean of its divisors is an integer number (36701091).

Almost surely, 2^73402181 is an apocalyptic number.

It is an amenable number.

73402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

73402181 is an equidigital number, since it uses as much as digits as its factorization.

73402181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 73402181 is about 8567.5072804171. The cubic root of 73402181 is about 418.7000262336.

The spelling of 73402181 in words is "seventy-three million, four hundred two thousand, one hundred eighty-one".