73231729 has 2 divisors, whose sum is σ = 73231730. Its totient is φ = 73231728.

The previous prime is 73231723. The next prime is 73231771. The reversal of 73231729 is 92713237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 1440000 = 8473^2 + 1200^2 .

It is an emirp because it is prime and its reverse (92713237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73231729 - 2³ = 73231721 is a prime.

It is a super-2 number, since 2×73231729² = 10725772264658882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 73231694 and 73231703.

It is not a weakly prime, because it can be changed into another prime (73231721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36615864 + 36615865.

It is an arithmetic number, because the mean of its divisors is an integer number (36615865).

Almost surely, 2^73231729 is an apocalyptic number.

It is an amenable number.

73231729 is a deficient number, since it is larger than the sum of its proper divisors (1).

73231729 is an equidigital number, since it uses as much as digits as its factorization.

73231729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 34.

The square root of 73231729 is about 8557.5539145249. The cubic root of 73231729 is about 418.3756781454.

The spelling of 73231729 in words is "seventy-three million, two hundred thirty-one thousand, seven hundred twenty-nine".