73581869 has 2 divisors, whose sum is σ = 73581870. Its totient is φ = 73581868.

The previous prime is 73581821. The next prime is 73581881. The reversal of 73581869 is 96818537.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 8779369 = 8050^2 + 2963^2 .

It is an emirp because it is prime and its reverse (96818537) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73581869 - 2²⁴ = 56804653 is a prime.

It is a super-2 number, since 2×73581869² = 10828582891066322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73581769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36790934 + 36790935.

It is an arithmetic number, because the mean of its divisors is an integer number (36790935).

Almost surely, 2^73581869 is an apocalyptic number.

It is an amenable number.

73581869 is a deficient number, since it is larger than the sum of its proper divisors (1).

73581869 is an equidigital number, since it uses as much as digits as its factorization.

73581869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 73581869 is about 8577.9874679321. The cubic root of 73581869 is about 419.0414060162.

The spelling of 73581869 in words is "seventy-three million, five hundred eighty-one thousand, eight hundred sixty-nine".