75408913 has 2 divisors, whose sum is σ = 75408914.
Its totient is φ = 75408912.
The previous prime is 75408869. The next prime is 75408937. The reversal of 75408913 is 31980457.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 46335249 + 29073664 = 6807^2 + 5392^2
It is an emirp because it is prime and its reverse (31980457) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 75408913 - 221 = 73311761 is a prime.
It is not a weakly prime, because it can be changed into another prime (75408943) 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, 37704456 + 37704457.
It is an arithmetic number, because the mean of its divisors is an integer number (37704457).
Almost surely, 275408913 is an apocalyptic number.
It is an amenable number.
75408913 is a deficient number, since it is larger than the sum of its proper divisors (1).
75408913 is an equidigital number, since it uses as much as digits as its factorization.
75408913 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 30240, while the sum is 37.
The square root of 75408913 is about 8683.8305487843.
The cubic root of 75408913 is about 422.4813674777.
The spelling of 75408913 in words is "seventy-five million, four hundred eight thousand, nine hundred thirteen".