7845121 has 2 divisors, whose sum is σ = 7845122. Its totient is φ = 7845120.

The previous prime is 7845107. The next prime is 7845127. The reversal of 7845121 is 1215487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 748225 = 2664^2 + 865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7845121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7845121.

It is not a weakly prime, because it can be changed into another prime (7845127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3922560 + 3922561.

It is an arithmetic number, because the mean of its divisors is an integer number (3922561).

Almost surely, 2^7845121 is an apocalyptic number.

It is an amenable number.

7845121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7845121 is an equidigital number, since it uses as much as digits as its factorization.

7845121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 7845121 is about 2800.9143150050. The cubic root of 7845121 is about 198.7009219167.

The spelling of 7845121 in words is "seven million, eight hundred forty-five thousand, one hundred twenty-one".