7851121 has 2 divisors, whose sum is σ = 7851122. Its totient is φ = 7851120.

The previous prime is 7851113. The next prime is 7851143. The reversal of 7851121 is 1211587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4260096 + 3591025 = 2064^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 7851121 - 2³ = 7851113 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7851101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3925560 + 3925561.

It is an arithmetic number, because the mean of its divisors is an integer number (3925561).

Almost surely, 2^7851121 is an apocalyptic number.

It is an amenable number.

7851121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7851121 is an equidigital number, since it uses as much as digits as its factorization.

7851121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560, while the sum is 25.

The square root of 7851121 is about 2801.9851891115. The cubic root of 7851121 is about 198.7515649310.

The spelling of 7851121 in words is "seven million, eight hundred fifty-one thousand, one hundred twenty-one".