73026521 has 4 divisors (see below), whose sum is σ = 73397412. Its totient is φ = 72655632.

The previous prime is 73026487. The next prime is 73026523. The reversal of 73026521 is 12562037.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12562037 = 31 ⋅405227.

It can be written as a sum of positive squares in 2 ways, for example, as 66650896 + 6375625 = 8164^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 73026521 - 2¹⁰ = 73025497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73026523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185150 + ... + 185543.

It is an arithmetic number, because the mean of its divisors is an integer number (18349353).

Almost surely, 2^73026521 is an apocalyptic number.

It is an amenable number.

73026521 is a deficient number, since it is larger than the sum of its proper divisors (370891).

73026521 is a wasteful number, since it uses less digits than its factorization.

73026521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370890.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 73026521 is about 8545.5556285124. Note that the first 3 decimals coincide. The cubic root of 73026521 is about 417.9845254987.

Adding to 73026521 its reverse (12562037), we get a palindrome (85588558).

The spelling of 73026521 in words is "seventy-three million, twenty-six thousand, five hundred twenty-one".