73126321 has 2 divisors, whose sum is σ = 73126322. Its totient is φ = 73126320.

The previous prime is 73126301. The next prime is 73126327. The reversal of 73126321 is 12362137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 10890000 = 7889^2 + 3300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73126321 is a prime.

It is not a weakly prime, because it can be changed into another prime (73126327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36563160 + 36563161.

It is an arithmetic number, because the mean of its divisors is an integer number (36563161).

Almost surely, 2^73126321 is an apocalyptic number.

It is an amenable number.

73126321 is a deficient number, since it is larger than the sum of its proper divisors (1).

73126321 is an equidigital number, since it uses as much as digits as its factorization.

73126321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 25.

The square root of 73126321 is about 8551.3929274709. The cubic root of 73126321 is about 418.1748484417.

Adding to 73126321 its reverse (12362137), we get a palindrome (85488458).

The spelling of 73126321 in words is "seventy-three million, one hundred twenty-six thousand, three hundred twenty-one".