73185557 has 2 divisors, whose sum is σ = 73185558. Its totient is φ = 73185556.

The previous prime is 73185529. The next prime is 73185559. The reversal of 73185557 is 75558137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73170916 + 14641 = 8554^2 + 121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73185557 is a prime.

It is a super-2 number, since 2×73185557² = 10712251506800498, which contains 22 as substring.

Together with 73185559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73185559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36592778 + 36592779.

It is an arithmetic number, because the mean of its divisors is an integer number (36592779).

Almost surely, 2^73185557 is an apocalyptic number.

It is an amenable number.

73185557 is a deficient number, since it is larger than the sum of its proper divisors (1).

73185557 is an equidigital number, since it uses as much as digits as its factorization.

73185557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 147000, while the sum is 41.

The square root of 73185557 is about 8554.8557556513. The cubic root of 73185557 is about 418.2877321905.

The spelling of 73185557 in words is "seventy-three million, one hundred eighty-five thousand, five hundred fifty-seven".