75125809 has 4 divisors (see below), whose sum is σ = 81955440. Its totient is φ = 68296180.

The previous prime is 75125783. The next prime is 75125837. The reversal of 75125809 is 90852157.

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 75125809 - 2⁵ = 75125777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75125509) 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, 3414799 + ... + 3414820.

It is an arithmetic number, because the mean of its divisors is an integer number (20488860).

Almost surely, 2^75125809 is an apocalyptic number.

It is an amenable number.

75125809 is a deficient number, since it is larger than the sum of its proper divisors (6829631).

75125809 is a wasteful number, since it uses less digits than its factorization.

75125809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6829630.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 75125809 is about 8667.5145803166. The cubic root of 75125809 is about 421.9520040800.

The spelling of 75125809 in words is "seventy-five million, one hundred twenty-five thousand, eight hundred nine".