75661129 has 2 divisors, whose sum is σ = 75661130. Its totient is φ = 75661128.

The previous prime is 75661109. The next prime is 75661133. The reversal of 75661129 is 92116657.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42575625 + 33085504 = 6525^2 + 5752^2 .

It is an emirp because it is prime and its reverse (92116657) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75661129 - 2⁹ = 75660617 is a prime.

It is not a weakly prime, because it can be changed into another prime (75661109) 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, 37830564 + 37830565.

It is an arithmetic number, because the mean of its divisors is an integer number (37830565).

Almost surely, 2^75661129 is an apocalyptic number.

It is an amenable number.

75661129 is a deficient number, since it is larger than the sum of its proper divisors (1).

75661129 is an equidigital number, since it uses as much as digits as its factorization.

75661129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 75661129 is about 8698.3405888710. The cubic root of 75661129 is about 422.9518599729.

The spelling of 75661129 in words is "seventy-five million, six hundred sixty-one thousand, one hundred twenty-nine".