75129389 has 2 divisors, whose sum is σ = 75129390. Its totient is φ = 75129388.

The previous prime is 75129377. The next prime is 75129391. The reversal of 75129389 is 98392157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63282025 + 11847364 = 7955^2 + 3442^2 .

It is a cyclic number.

It is not a de Polignac number, because 75129389 - 2⁸ = 75129133 is a prime.

Together with 75129391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75129319) 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, 37564694 + 37564695.

It is an arithmetic number, because the mean of its divisors is an integer number (37564695).

Almost surely, 2^75129389 is an apocalyptic number.

It is an amenable number.

75129389 is a deficient number, since it is larger than the sum of its proper divisors (1).

75129389 is an equidigital number, since it uses as much as digits as its factorization.

75129389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 44.

The square root of 75129389 is about 8667.7210961129. The cubic root of 75129389 is about 421.9587064556.

The spelling of 75129389 in words is "seventy-five million, one hundred twenty-nine thousand, three hundred eighty-nine".