7275257321 has 4 divisors (see below), whose sum is σ = 7703213652. Its totient is φ = 6847300992.

The previous prime is 7275257299. The next prime is 7275257369. The reversal of 7275257321 is 1237525727.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3485131225 + 3790126096 = 59035^2 + 61564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7275257321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7275257021) 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 3 ways as a sum of consecutive naturals, for example, 213978140 + ... + 213978173.

It is an arithmetic number, because the mean of its divisors is an integer number (1925803413).

Almost surely, 2^7275257321 is an apocalyptic number.

It is an amenable number.

7275257321 is a deficient number, since it is larger than the sum of its proper divisors (427956331).

7275257321 is a wasteful number, since it uses less digits than its factorization.

7275257321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427956330.

The product of its digits is 205800, while the sum is 41.

The square root of 7275257321 is about 85295.1189752380. The cubic root of 7275257321 is about 1937.6832550135.

The spelling of 7275257321 in words is "seven billion, two hundred seventy-five million, two hundred fifty-seven thousand, three hundred twenty-one".