75556139 has 2 divisors, whose sum is σ = 75556140. Its totient is φ = 75556138.

The previous prime is 75556087. The next prime is 75556157. The reversal of 75556139 is 93165557.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75556139 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 75556096 and 75556105.

It is not a weakly prime, because it can be changed into another prime (75576139) 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, 37778069 + 37778070.

It is an arithmetic number, because the mean of its divisors is an integer number (37778070).

Almost surely, 2^75556139 is an apocalyptic number.

75556139 is a deficient number, since it is larger than the sum of its proper divisors (1).

75556139 is an equidigital number, since it uses as much as digits as its factorization.

75556139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141750, while the sum is 41.

The square root of 75556139 is about 8692.3034346484. The cubic root of 75556139 is about 422.7561352026.

The spelling of 75556139 in words is "seventy-five million, five hundred fifty-six thousand, one hundred thirty-nine".