7297273521 has 18 divisors (see below), whose sum is σ = 10800020322. Its totient is φ = 4745126880.

The previous prime is 7297273519. The next prime is 7297273537. The reversal of 7297273521 is 1253727927.

7297273521 is a `hidden beast` number, since 7 + 297 + 2 + 7 + 352 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4449557025 + 2847716496 = 66705^2 + 53364^2 .

It is not a de Polignac number, because 7297273521 - 2¹ = 7297273519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7297273421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1638720 + ... + 1643166.

It is an arithmetic number, because the mean of its divisors is an integer number (600001129).

Almost surely, 2^7297273521 is an apocalyptic number.

It is an amenable number.

7297273521 is a deficient number, since it is larger than the sum of its proper divisors (3502746801).

7297273521 is an frugal number, since it uses more digits than its factorization.

7297273521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8941 (or 4491 counting only the distinct ones).

The product of its digits is 370440, while the sum is 45.

The square root of 7297273521 is about 85424.0804515916. The cubic root of 7297273521 is about 1939.6358760581.

The spelling of 7297273521 in words is "seven billion, two hundred ninety-seven million, two hundred seventy-three thousand, five hundred twenty-one".