75281009 has 4 divisors (see below), whose sum is σ = 75618816. Its totient is φ = 74943204.

The previous prime is 75280987. The next prime is 75281023. The reversal of 75281009 is 90018257.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75281009 - 2¹² = 75276913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75281039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168569 + ... + 169014.

It is an arithmetic number, because the mean of its divisors is an integer number (18904704).

Almost surely, 2^75281009 is an apocalyptic number.

It is an amenable number.

75281009 is a deficient number, since it is larger than the sum of its proper divisors (337807).

75281009 is a wasteful number, since it uses less digits than its factorization.

75281009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337806.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 75281009 is about 8676.4629314024. The cubic root of 75281009 is about 422.2423699245.

The spelling of 75281009 in words is "seventy-five million, two hundred eighty-one thousand, nine".