75139517 has 2 divisors, whose sum is σ = 75139518. Its totient is φ = 75139516.

The previous prime is 75139481. The next prime is 75139523. The reversal of 75139517 is 71593157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73034116 + 2105401 = 8546^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 75139517 - 2¹² = 75135421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75139117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37569758 + 37569759.

It is an arithmetic number, because the mean of its divisors is an integer number (37569759).

Almost surely, 2^75139517 is an apocalyptic number.

It is an amenable number.

75139517 is a deficient number, since it is larger than the sum of its proper divisors (1).

75139517 is an equidigital number, since it uses as much as digits as its factorization.

75139517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33075, while the sum is 38.

The square root of 75139517 is about 8668.3053130355. The cubic root of 75139517 is about 421.9776666602.

The spelling of 75139517 in words is "seventy-five million, one hundred thirty-nine thousand, five hundred seventeen".