75809917 has 2 divisors, whose sum is σ = 75809918. Its totient is φ = 75809916.

The previous prime is 75809887. The next prime is 75809939. The reversal of 75809917 is 71990857.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74287161 + 1522756 = 8619^2 + 1234^2 .

It is an emirp because it is prime and its reverse (71990857) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75809917 - 2¹⁹ = 75285629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75809947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37904958 + 37904959.

It is an arithmetic number, because the mean of its divisors is an integer number (37904959).

Almost surely, 2^75809917 is an apocalyptic number.

It is an amenable number.

75809917 is a deficient number, since it is larger than the sum of its proper divisors (1).

75809917 is an equidigital number, since it uses as much as digits as its factorization.

75809917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 75809917 is about 8706.8890540767. The cubic root of 75809917 is about 423.2289241067.

The spelling of 75809917 in words is "seventy-five million, eight hundred nine thousand, nine hundred seventeen".