75129121 has 2 divisors, whose sum is σ = 75129122. Its totient is φ = 75129120.

The previous prime is 75129113. The next prime is 75129133. The reversal of 75129121 is 12192157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69889600 + 5239521 = 8360^2 + 2289^2 .

It is an emirp because it is prime and its reverse (12192157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75129121 - 2³ = 75129113 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75129121.

It is not a weakly prime, because it can be changed into another prime (75129101) 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, 37564560 + 37564561.

It is an arithmetic number, because the mean of its divisors is an integer number (37564561).

Almost surely, 2^75129121 is an apocalyptic number.

It is an amenable number.

75129121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75129121 is an equidigital number, since it uses as much as digits as its factorization.

75129121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 75129121 is about 8667.7056364415. The cubic root of 75129121 is about 421.9582047209.

The spelling of 75129121 in words is "seventy-five million, one hundred twenty-nine thousand, one hundred twenty-one".