75161209 has 2 divisors, whose sum is σ = 75161210. Its totient is φ = 75161208.

The previous prime is 75161183. The next prime is 75161227. The reversal of 75161209 is 90216157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 3250809 = 8480^2 + 1803^2 .

It is an emirp because it is prime and its reverse (90216157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75161209 - 2⁹ = 75160697 is a prime.

It is not a weakly prime, because it can be changed into another prime (75161249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37580604 + 37580605.

It is an arithmetic number, because the mean of its divisors is an integer number (37580605).

Almost surely, 2^75161209 is an apocalyptic number.

It is an amenable number.

75161209 is a deficient number, since it is larger than the sum of its proper divisors (1).

75161209 is an equidigital number, since it uses as much as digits as its factorization.

75161209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 75161209 is about 8669.5564477083. The cubic root of 75161209 is about 422.0182696133.

The spelling of 75161209 in words is "seventy-five million, one hundred sixty-one thousand, two hundred nine".