75212109 has 36 divisors (see below), whose sum is σ = 130756860. Its totient is φ = 41489280.

The previous prime is 75212099. The next prime is 75212129. The reversal of 75212109 is 90121257.

It can be written as a sum of positive squares in 2 ways, for example, as 51883209 + 23328900 = 7203^2 + 4830^2 .

It is a de Polignac number, because none of the positive numbers 2^k-75212109 is a prime.

It is a super-2 number, since 2×75212109² = 11313722680455762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75212129) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9849 + ... + 15729.

It is an arithmetic number, because the mean of its divisors is an integer number (3632135).

Almost surely, 2^75212109 is an apocalyptic number.

It is an amenable number.

75212109 is a deficient number, since it is larger than the sum of its proper divisors (55544751).

75212109 is a wasteful number, since it uses less digits than its factorization.

75212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5930 (or 5920 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 75212109 is about 8672.4915105176. The cubic root of 75212109 is about 422.1135132593.

The spelling of 75212109 in words is "seventy-five million, two hundred twelve thousand, one hundred nine".