7578161 has 2 divisors, whose sum is σ = 7578162. Its totient is φ = 7578160.

The previous prime is 7578143. The next prime is 7578163. The reversal of 7578161 is 1618757.

7578161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4752400 + 2825761 = 2180^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 7578161 - 2⁶ = 7578097 is a prime.

Together with 7578163, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7578163) 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, 3789080 + 3789081.

It is an arithmetic number, because the mean of its divisors is an integer number (3789081).

Almost surely, 2^7578161 is an apocalyptic number.

It is an amenable number.

7578161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7578161 is an equidigital number, since it uses as much as digits as its factorization.

7578161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 35.

The square root of 7578161 is about 2752.8459818886. The cubic root of 7578161 is about 196.4210112289.

The spelling of 7578161 in words is "seven million, five hundred seventy-eight thousand, one hundred sixty-one".