73521251 has 4 divisors (see below), whose sum is σ = 73550904. Its totient is φ = 73491600.

The previous prime is 73521223. The next prime is 73521269. The reversal of 73521251 is 15212537.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73521251 - 2¹⁴ = 73504867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73521251.

It is not an unprimeable number, because it can be changed into a prime (73521451) 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, 10730 + ... + 16191.

It is an arithmetic number, because the mean of its divisors is an integer number (18387726).

Almost surely, 2^73521251 is an apocalyptic number.

73521251 is a deficient number, since it is larger than the sum of its proper divisors (29653).

73521251 is a wasteful number, since it uses less digits than its factorization.

73521251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29652.

The product of its digits is 2100, while the sum is 26.

The square root of 73521251 is about 8574.4533936572. The cubic root of 73521251 is about 418.9263032476.

Adding to 73521251 its reverse (15212537), we get a palindrome (88733788).

The spelling of 73521251 in words is "seventy-three million, five hundred twenty-one thousand, two hundred fifty-one".