75189749 has 2 divisors, whose sum is σ = 75189750. Its totient is φ = 75189748.

The previous prime is 75189743. The next prime is 75189761. The reversal of 75189749 is 94798157.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 9498724 = 8105^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 75189749 - 2⁸ = 75189493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75189697 and 75189706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75189743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37594874 + 37594875.

It is an arithmetic number, because the mean of its divisors is an integer number (37594875).

Almost surely, 2^75189749 is an apocalyptic number.

It is an amenable number.

75189749 is a deficient number, since it is larger than the sum of its proper divisors (1).

75189749 is an equidigital number, since it uses as much as digits as its factorization.

75189749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 75189749 is about 8671.2022811142. The cubic root of 75189749 is about 422.0716787118.

The spelling of 75189749 in words is "seventy-five million, one hundred eighty-nine thousand, seven hundred forty-nine".