7087321 has 4 divisors (see below), whose sum is σ = 7118500. Its totient is φ = 7056144.

The previous prime is 7087309. The next prime is 7087331. The reversal of 7087321 is 1237807.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1237807 = 29 ⋅42683.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 384400 = 2589^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 7087321 - 2¹⁷ = 6956249 is a prime.

It is a Duffinian number.

7087321 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7087321.

It is not an unprimeable number, because it can be changed into a prime (7087331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15246 + ... + 15703.

It is an arithmetic number, because the mean of its divisors is an integer number (1779625).

Almost surely, 2^7087321 is an apocalyptic number.

It is an amenable number.

7087321 is a deficient number, since it is larger than the sum of its proper divisors (31179).

7087321 is a wasteful number, since it uses less digits than its factorization.

7087321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31178.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 7087321 is about 2662.2022838244. The cubic root of 7087321 is about 192.0852576363.

The spelling of 7087321 in words is "seven million, eighty-seven thousand, three hundred twenty-one".