75945109 has 4 divisors (see below), whose sum is σ = 79942240. Its totient is φ = 71947980.

The previous prime is 75945101. The next prime is 75945119. The reversal of 75945109 is 90154957.

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 75945109 - 2³ = 75945101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75945101) 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, 1998537 + ... + 1998574.

It is an arithmetic number, because the mean of its divisors is an integer number (19985560).

Almost surely, 2^75945109 is an apocalyptic number.

It is an amenable number.

75945109 is a deficient number, since it is larger than the sum of its proper divisors (3997131).

75945109 is a wasteful number, since it uses less digits than its factorization.

75945109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997130.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 75945109 is about 8714.6491036645. The cubic root of 75945109 is about 423.4803564118.

The spelling of 75945109 in words is "seventy-five million, nine hundred forty-five thousand, one hundred nine".