73197521 has 4 divisors (see below), whose sum is σ = 74228544. Its totient is φ = 72166500.

The previous prime is 73197469. The next prime is 73197547. The reversal of 73197521 is 12579137.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12579137 = 23 ⋅546919.

It is a cyclic number.

It is not a de Polignac number, because 73197521 - 2⁶ = 73197457 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 (73197571) 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, 515405 + ... + 515546.

It is an arithmetic number, because the mean of its divisors is an integer number (18557136).

Almost surely, 2^73197521 is an apocalyptic number.

73197521 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

73197521 is a deficient number, since it is larger than the sum of its proper divisors (1031023).

73197521 is a wasteful number, since it uses less digits than its factorization.

73197521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031022.

The product of its digits is 13230, while the sum is 35.

The square root of 73197521 is about 8555.5549790765. The cubic root of 73197521 is about 418.3105241272.

The spelling of 73197521 in words is "seventy-three million, one hundred ninety-seven thousand, five hundred twenty-one".