7087921 has 2 divisors, whose sum is σ = 7087922. Its totient is φ = 7087920.

The previous prime is 7087907. The next prime is 7087937. The reversal of 7087921 is 1297807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 12321 = 2660^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 7087921 - 2⁵ = 7087889 is a prime.

7087921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7087901) 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 as a sum of consecutive naturals, namely, 3543960 + 3543961.

It is an arithmetic number, because the mean of its divisors is an integer number (3543961).

Almost surely, 2^7087921 is an apocalyptic number.

It is an amenable number.

7087921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7087921 is an equidigital number, since it uses as much as digits as its factorization.

7087921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 7087921 is about 2662.3149700965. The cubic root of 7087921 is about 192.0906780155.

It can be divided in two parts, 7087 and 921, that added together give a palindrome (8008).

The spelling of 7087921 in words is "seven million, eighty-seven thousand, nine hundred twenty-one".