75249521 has 2 divisors, whose sum is σ = 75249522. Its totient is φ = 75249520.

The previous prime is 75249479. The next prime is 75249547. The reversal of 75249521 is 12594257.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41783296 + 33466225 = 6464^2 + 5785^2 .

It is a cyclic number.

It is not a de Polignac number, because 75249521 - 2¹⁰ = 75248497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75249571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37624760 + 37624761.

It is an arithmetic number, because the mean of its divisors is an integer number (37624761).

Almost surely, 2^75249521 is an apocalyptic number.

It is an amenable number.

75249521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75249521 is an equidigital number, since it uses as much as digits as its factorization.

75249521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The square root of 75249521 is about 8674.6481773038. The cubic root of 75249521 is about 422.1834908788.

The spelling of 75249521 in words is "seventy-five million, two hundred forty-nine thousand, five hundred twenty-one".