73145381 has 2 divisors, whose sum is σ = 73145382. Its totient is φ = 73145380.

The previous prime is 73145377. The next prime is 73145393. The reversal of 73145381 is 18354137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 23668225 = 7034^2 + 4865^2 .

It is an emirp because it is prime and its reverse (18354137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73145381 - 2² = 73145377 is a prime.

It is a super-2 number, since 2×73145381² = 10700493523270322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73145341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36572690 + 36572691.

It is an arithmetic number, because the mean of its divisors is an integer number (36572691).

Almost surely, 2^73145381 is an apocalyptic number.

It is an amenable number.

73145381 is a deficient number, since it is larger than the sum of its proper divisors (1).

73145381 is an equidigital number, since it uses as much as digits as its factorization.

73145381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 73145381 is about 8552.5072931860. The cubic root of 73145381 is about 418.2111769945.

The spelling of 73145381 in words is "seventy-three million, one hundred forty-five thousand, three hundred eighty-one".