75561149 has 2 divisors, whose sum is σ = 75561150. Its totient is φ = 75561148.

The previous prime is 75561139. The next prime is 75561169. The reversal of 75561149 is 94116557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 10355524 = 8075^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 75561149 - 2⁴ = 75561133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75561139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37780574 + 37780575.

It is an arithmetic number, because the mean of its divisors is an integer number (37780575).

Almost surely, 2^75561149 is an apocalyptic number.

It is an amenable number.

75561149 is a deficient number, since it is larger than the sum of its proper divisors (1).

75561149 is an equidigital number, since it uses as much as digits as its factorization.

75561149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 75561149 is about 8692.5916158531. The cubic root of 75561149 is about 422.7654790780.

The spelling of 75561149 in words is "seventy-five million, five hundred sixty-one thousand, one hundred forty-nine".