73255781 has 2 divisors, whose sum is σ = 73255782. Its totient is φ = 73255780.

The previous prime is 73255747. The next prime is 73255799. The reversal of 73255781 is 18755237.

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., 41152225 + 32103556 = 6415^2 + 5666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73255781 is a prime.

It is a super-2 number, since 2×73255781² = 10732818899839922, 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 (73255181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36627890 + 36627891.

It is an arithmetic number, because the mean of its divisors is an integer number (36627891).

Almost surely, 2^73255781 is an apocalyptic number.

It is an amenable number.

73255781 is a deficient number, since it is larger than the sum of its proper divisors (1).

73255781 is an equidigital number, since it uses as much as digits as its factorization.

73255781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 38.

The square root of 73255781 is about 8558.9591072747. The cubic root of 73255781 is about 418.4214764649.

The spelling of 73255781 in words is "seventy-three million, two hundred fifty-five thousand, seven hundred eighty-one".