75242539 has 2 divisors, whose sum is σ = 75242540. Its totient is φ = 75242538.

The previous prime is 75242513. The next prime is 75242543. The reversal of 75242539 is 93524257.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 75242539 - 2⁷ = 75242411 is a prime.

It is a super-2 number, since 2×75242539² = 11322879350333042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 75242498 and 75242507.

It is not a weakly prime, because it can be changed into another prime (75242509) 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, 37621269 + 37621270.

It is an arithmetic number, because the mean of its divisors is an integer number (37621270).

Almost surely, 2^75242539 is an apocalyptic number.

75242539 is a deficient number, since it is larger than the sum of its proper divisors (1).

75242539 is an equidigital number, since it uses as much as digits as its factorization.

75242539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 37.

The square root of 75242539 is about 8674.2457308979. The cubic root of 75242539 is about 422.1704330934.

The spelling of 75242539 in words is "seventy-five million, two hundred forty-two thousand, five hundred thirty-nine".